Let Sn denote the sum of the cubes of the first n natural numbers and Sn denote the sum of the first natural numbers. Then equals
(a)
(b)
(c)
(d) None of these
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Solution
Let Sn denote the sum of the cubes of the first n natural numbers and Sn denotes the sum of the first n natural number 1.
Then
; formula for sum of cubes.