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I can't find mistake in my solution. Pic inside
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Why do you think there's a mistake? Looks fine to me.
Because i have the answer in my textbook and it's 64
Are you sure the sum is supposed to leave out \[C_6^1\], then? Maybe there's a typo.
I can't be sure, but i think so. Maybe you are right and there is a typo
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you are good its right
Whatever's going on in the textbook, everything you have written is correct.
Okay, thank you, guys!
your choose formulas are backwards
what was the original question?
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