If sum of the coefficients in the expansion 2×2−3cx+c2)17 is zero, then c is equal to 

If sum of the coefficients in the expansion 2x23cx+c2)17 is zero, then c is equal to 

  1. A

    2, 3

  2. B

    1, 2

  3. C

    1, 3

  4. D

    2, – 1

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    Solution:

    Sum of the coefficients =23c+c217

    We are given 23c+c217=0

    c23c+2=0c=1,2

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