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Question

The value of {24n15},nN is
(where {.} represents fractional part function)
  1. 115
  2. 1115
  3. 415
  4. 1415


Solution

The correct option is A 115
24n=16n=(1+15)n=1+ nC115+ nC2152++ nCn15n=1+15k,  kN

Now, 
24n15=k+115

Hence, {24n15}=115

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