Binomial TheoremHard

Question

In the expansion of

Options

A.the number of irrational terms is 19
B.middle term is irrational
C.the number of rational terms is 2
D.9th term is rational

Solution


For rational terms
20 - r = 3k & r = 4p, where k, p ∈ I
⇒   r = 20  &  r = 8
∴  no. of rational terms = 2
∴  no. of irrational terms = 19

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