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The number 39 + 312 + 315 + 3n is a perfect cube of an integer for natural number n equaling

Option 1 -

12

Option 2 -

13

Option 3 -

14

Option 4 -

15

0 1 View | Posted a month ago
Asked by Shiksha User

  • 1 Answer

  • R

    Answered by

    Raj Pandey | Contributor-Level 9

    a month ago
    Correct Option - 3


    Detailed Solution:

    For n = 14, 39 (1 + 33 + 36 + 35)

    = 39 (1 + 27 + 729 + 243)

    = 39 * 103.

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