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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