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Question

The middle term of the binomial expansion of (a+b)n is the 6th term. Find the possible values of n, if n is odd.


A

8

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B

9

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C

10

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D

11

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Solution

The correct options are
B

9


D

11


If n is odd, there will be two middle terms which are (n+12)th and (n+12+1)th

terms.

6 can be any of these values

n+12=6 or n+12+1=6

n + 1 = 12 or n + 1 = 10

n = 11 or n = 9


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