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  1. Find the sum of cube of first 15 natural numbers.
    1. 15400
    2. 14400
    3. 16800
    4. 13300
Correct Option: B

Sum of cubes of first n natural numbers = [ n(n+1) ]2
Given n = 15

∴ Required sum = [ ( 15 x 16 ) / 2 ] 2
= (15 x 8 )2
= 1202
= 14400


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