Asked by tris

Find the 5th term of the expression
1) (a-b) ^9
Answered by Reiny
for (a+b)^n
term(r+1) = C(n,r)(a^(n-r) b^r)

so for (a-b)^9
term(5) = C(9,4)(a^5)(-b)^4
= 126a^5 b^4
Answered by Ghengis
31
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