Question

The 9th term in the expansion of (x/a -3a/x^2)^12 is
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Answer 1

Answer:

Formula to find out nth term in binomial expansion of (p+q)m

nthterm=(mcn−1)pm+1−nqn−1

where, (mcn−1)=n!(m−n)!m!

For given problem,

p=ba, q=2a2−b, m=12

we have to find 9th term. Thus, n=9

∴9thterm=(12c8)(ba)12+1−9(2a2−b)9−1

∴9thterm=8!(12−8)!12!(

Answer 2

Answer:

90 is the ans

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