#Permutation/Combination

100 messages · Page 1 of 1 (latest)

shut flicker
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I only need help with B and C. Where to I begin and how to I arrive at an answer step by step?

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gray ploverBOT
kindred pike
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so for b, it must start with one of 6 letters. then end with one of five

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so 6 choices for the middle three letters

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so i think its 6x5x 6C3

harsh pier
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C ) vowels in problems are O, E

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So the first letter must be those 2

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And 2 * 7P4

shut flicker
shut flicker
humble tapir
shut flicker
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how about the 4?

humble tapir
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Sorry wait

shut flicker
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i'm slightly confused because there 8 total letters in PROBLEMS and 6 consonants so I was wondering why 7P4 instead of 8P6

humble tapir
# shut flicker how about the 4?

Since the the number of letters that need to be selected is 5 and we know that one of these must be a vowel the remaining positions left is 5-1=4

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Does that clarify it?

humble tapir
shut flicker
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ah yes please

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i'm sorry this is the topic I struggle most with I'm sorry for asking too many questions

humble tapir
shut flicker
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o7

humble tapir
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, rotate

stray stagBOT
humble tapir
# stray stag

Tell me if there is anything here that doesn't make sense

shut flicker
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the - - - - - represents the consonants right

humble tapir
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Because E can still be chosen in the first case

shut flicker
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ah so 5 letters?

humble tapir
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That is why I put O and E at the start

shut flicker
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ahh

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so once you chose any vowel O or E

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it'd down to 7 letters right?

humble tapir
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yes

shut flicker
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i still don't get the 4 ;;

humble tapir
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ok

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So the question says that we need to make a 5 letter word

shut flicker
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uh huh

humble tapir
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And after placing one vowel for the start of the word, how many letters still need to be chosen?

shut flicker
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ohhh oh

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for 5-1 bc the -1 is from the other vowel?

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which leaves 4?

humble tapir
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Correct

shut flicker
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OHHHH

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ok that makes sense now

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thank you thank you o7

humble tapir
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Np

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Do you still need help with the other questions?

shut flicker
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i probably will need help with other questions but I'll try to do the rest and figure out on my own before asking for help TT

humble tapir
shut flicker
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thank you!

humble tapir
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XD

shut flicker
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ah nvm i do need help on this

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1 x 2 and so on does 1 represent me taking 1 letter which is B and 2 is vowels

humble tapir
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Can you try using the format I did? It might help U visualise it better.

humble tapir
shut flicker
humble tapir
shut flicker
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S 4 3 2 1
O 4 3 2 1
E 4 3 2 1
so 3 different cases

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if i'm doing this right

humble tapir
humble tapir
shut flicker
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oh whoops not s I meant B

humble tapir
shut flicker
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B 4 3 2 1
any vowel 4 3 2 1?

humble tapir
shut flicker
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B 4 3 2 1
5 4 3 2 any vowel?

humble tapir
shut flicker
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B 4 3 2 O
B 4 3 2 E

humble tapir
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Yes

shut flicker
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oh-

humble tapir
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Except

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It would not be 4 3 2

shut flicker
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wait how come?

humble tapir
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You can't select 4 letters when there are only 3 positions left

shut flicker
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ah wait then

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how should i rephrase the above if not 4 3 2?

humble tapir
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How many letter can be placed in the second box?

shut flicker
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;;;

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please enlighten me ;;

humble tapir
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So it would be
B 3 2 1 (one of the vowels)

shut flicker
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what happened to the 5 and 4 if the vowels are at the end after 1? do they take the place of 0?

humble tapir
shut flicker
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how come they don't replace 1?

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since the 1 is at the very end and vowels are also said to be at the end

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nvm i think i figured it out

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sorry for bomboarding you with dumb questions

humble tapir
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Sorry I had to go

shut flicker
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nwnw