The greatest term in the expansion of (3 + 5x)15, when  x = 1/5 is 

The greatest term in the expansion of (3 + 5x)15, when  x = 1/5 is 

  1. A

     15C3313

  2. B

     15C4312

  3. C

     15C4310

  4. D

    none of these 

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    Solution:

    α=(15+1)(5)(1/5)3+5(1/5)=4

    Thus, 4th and 5th terms are the greatest, and T5=15C4(3)11

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