TNPSC Group 4 General Knowledge 2019 Paper

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Question : 99 of 100

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If 1 + 2 + ..... + n = K then 1³ + 2³ + .... + n³ is equal to

k²
k³
$\;{k\;(k\:\;+\;\:1)\;}/{2}$
(K + 1)³

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