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Question

If the sum of the first n terms of an AP is 5nn2, the common difference is ______


  1. -1

  2. 1

  3. -2

  4. 2


Solution

The correct option is D

2


Sn=5nn2    

T1=S1=5(1)(1)2=51=4

S2=T1+T2=5(2)(2)2=104=6

T2=S2T1=64=2

d=T2T1=2

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