What is the coefficient of z3y in (+y - 1)10?

Question

Question

Answer 1

Answer #1

This question is based on the multinomial Theorem formula is also provided in the solution:-

Sohn 2r a b c ese we hort 1 0 (-1))ラ 20e want χ.yt 3 4 9 1S420 0 emce Coehdie

Answer 2

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