If 12 + 22 + …+ n2 = 1015, then value of n is

If 12 + 22 + + n2 = 1015, then value of n is

  1. A

    15

  2. B

    14

  3. C

    13

  4. D

    16

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    Solution:

    16n(n+1)(2n+1)=1015(2n)(2n+1)(2n+2)=(28)(29)(30)2n=28 or n=14

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