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If 1 + 2 + 3 + …+ k = N^2 and N is less ...

If `1 + 2 + 3 + …+ k = N^2` and N is less than 100 then the value of k can be, where `N in N` Natural Numbers:

A

8

B

1 and 49

C

8 and 36

D

both (a) and (b)

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The correct Answer is:
D
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