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Question

The series of natural numbers is written as follows:
1
2 3 4
5 6 7 8 9
... ... ...
... ... ...
Find the sum of the numbers in the nth row:

A
n3+1
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B
(2n)21
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C
n3+(n1)3
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D
None of these
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Solution

The correct option is C n3+(n1)3
Go through options.
Let us consider choice (c)
for n = 1, S1=(1)3+(11)3= 1for n=2, S2=(2)3+(21)3= 9for n=3, S3=(3)3+(31)3= 35
Hence choice (c) is correct.

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