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[narrow zenith]

need help with d)

[rough dragon]

6 * 5 * 4/216

[narrow zenith]

what?

[rough dragon]

how much do you know Combi?

[narrow zenith]

I know nothing about combinatorics, if that's what you're talking about

[rough dragon]

oh

[narrow zenith]

it's fine, i pretty much figured it out

[rough dragon]

So, lets see

if two dices are rolled, whats the probabilty of them being different

[narrow zenith]

5/6

[rough dragon]

nice

so

how'd you get that

[narrow zenith]

well I just drew up a two way table with 1st roll and 2nd roll and found 30/36 outcomes are different numbers

[rough dragon]

thats a long method

lets simplify it

[narrow zenith]

alright

[rough dragon]

lets assume , when we role the dice, we get 3

[narrow zenith]

k

[rough dragon]

whats the probability of us not getting 3 on the next role

[narrow zenith]

5/6

[rough dragon]

yes

[narrow zenith]

oh i get it

[rough dragon]

whats the answer then?

[narrow zenith]

this can be generalised

[narrow zenith]

for what

what I was thinking was

[rough dragon]

oh

lets tackle problem D then

lets say we roll 6 on the first roll

[narrow zenith]

a * a' + b * b' + ... + f* f', where a-f is 1-6 and probability of each is 1/6 and it's complement 5/6, it gives us 5/6

[narrow zenith]

alright

[rough dragon]

whats the probability of the next number not being 6?

[narrow zenith]

5/6

[rough dragon]

lets say we roll 3

in the 2nd roll

whats the probability, that the dice wont roll 3 and 6 in the 3 rd roll?

[narrow zenith]

4/6

[rough dragon]

okay

lemme explain a concept

how many combinations of a cap and a shirt are possible if you have 3 caps and 2 shirts?

[narrow zenith]

6?

[rough dragon]

yeah

thats 3*2

[narrow zenith]

yeah

[rough dragon]

so, coming back to the question

what is 4/6 * 5/6

[narrow zenith]

5/9

that's the answer

[rough dragon]

yup

understood why?

[narrow zenith]

sort of

I'm reading through this again

[narrow zenith]

I get it

thanks @rough dragon

[vapid pewter]

@narrow zenith has given 1 rep to @rough dragon

[narrow zenith]

also the combination thing, 666 combinatations possible

216

+close