Almost there | Mathematics | Page 1

glad oasisBOT Apr 25, 2023, 7:30 PM

#

crystal steepleBOT Apr 25, 2023, 7:30 PM

#

Epik Gamer

strong tangle Apr 26, 2023, 1:40 AM

#

What do you understand and where are you stuck?

#

It's helpful for you to figure out what you can, and it's helpful for us to answer what helps you. For example, someone asking this question might not even know what \binom{n}{r} means

cloud olive Apr 26, 2023, 5:08 AM

#

You have to understand how Grogg got his answer. Try solving it yourself and compare to Grogg's answer.

crystal steepleBOT Apr 26, 2023, 7:06 PM

#

Epik Gamer

abstract depot Apr 26, 2023, 7:29 PM

#

15 because 6 C 2 = 15?

#

hm yeah

#

at least that part

#

not so sure about the terms before it

#

you dont count duplicate letters

#

AAAACC for example

#

you wouldve count that twice

#

im referring to 6 C 4 * 25^2

#

no wait

#

yeah

#

i remember doing a problem like this on aops a few years ago lol

#

10

#

my skills have recessed a lot 💀

#

yeah i think 15 is right but im not sure about the other terms

#

im just trying to find counter cases

#

idk if its right or wrong

strong tangle Apr 26, 2023, 8:46 PM

#

This is correct. And the -15 is correct as well, for the reasons that you stated.

#Almost there