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Sum of first 20 terms of 3/1^2 + 5/(1^2...

Sum of first 20 terms of ` 3/1^2 + 5/(1^2 + 2^2) + 7/(1^2 + 2^2 + 3^2) `+... upto 20 terms is `k/21`, then k is equal to :

A

240

B

120

C

60

D

80

Text Solution

Verified by Experts

The correct Answer is:
B
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