Coefficient of x10 in the expansion of 1+x210x2+2+1×25 is

Coefficient of x10 in the expansion of 1+x210x2+2+1x25 is

  1. A

     10C5

  2. B

     15C5

  3. C

    0

  4. D

    2

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    Solution:

    1+x210 x2+2+1x2

    =1+x210 x+1x5=1x51+x215

    coefficient of x10 in 1+x2x2+2+1x25

    = coefficient of x15 in 1+x215=0.

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