is anyone willing to check these for me?
1) What is the coefficient of y^3 in the expansion of (1+y^6)
2) The coefficient of a^2b^5 in the expansion of (a+b)^7
3) the term a^2b^3 in the expansion of (a+2b)^5
4) The expansion of (x+y)^8 contains the term
I said c
Thanks very muchly xxxxx
Haven't done Binomial Expansion for a while, but I gave them a shot and got pretty much the same: Q1 is correct, Q2 is correct, (although I'm not sure why you've stuck a plus sign in your answer...), Q3 was the only one I differed on, but that's probably because I haven't done this stuff in a while - I don't know where 80 was from, but assume you're right..., and Q4 is correct.
well, yes, but that plus sign shouldn't be there.
thanks, i think the plus sign was a typo.
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