Question

I can't find mistake in my solution. Pic inside

Answer 1

Why do you think there's a mistake? Looks fine to me.

Answer 2

Because i have the answer in my textbook and it's 64

Answer 3

Are you sure the sum is supposed to leave out \[C_6^1\], then? Maybe there's a typo.

Answer 4

I can't be sure, but i think so. Maybe you are right and there is a typo

Answer 5

you are good its right

Answer 6

Whatever's going on in the textbook, everything you have written is correct.

Answer 7

Okay, thank you, guys!

Answer 8

your choose formulas are backwards

Answer 9

what was the original question?