In the expansion of `(1+x)^(70)`, the sum of coefficients of odd powers of `x` is
In the expansion of `(1+x)^(70)`, the sum of coefficients of odd powers of `x` is
A. `0`
B. `2^(69)`
C. `2^(70)`
D. `2^(71)`
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Correct Answer - B
`(b)` The sum of the coefficients of odd powers in the expansion of `(1+x)^(n)`
`=` sum of the coefficients of even powers in `(1+x)^(n)`
`=2^(n-1)=2^(70-1)=2^(69)`
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