Questions
Sum of two middle terms in the expansion of is
a
2n−1Cn−1
b
2n−1Cn
c
2nCn
d
2nCn+1
detailed solution
Correct option is C
Two middle terms in the expansion of (1+x)2n−1 are 2n−1+12th and 2n−1+12+1th terms, that is, nth and (n+1)th terms.Coefficients of the middle terms in the expansion of(1+x)2n−1 are 2n−1Cn−1 and 2n−1Cn and their sum=2n−1Cn−1+2n−1Cn=2nCnTalk to our academic expert!
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The sum of the real values of x for which the middle term in the binomial expansion of equals 5670 is
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