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Question

(112+122+132+.....202)=?

A
385
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B
2485
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C
2870
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D
3255
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Solution

The correct option is B 2485
(112+122+132+.....202)=(12+22+32+.....202)(12+22+32+.....102)[Ref:(12+22+32+.....n2)=16n(n+1)(2n+1)](112+122+132+.....202)=(12+22+32+.....202)(12+22+32+.....102)[Ref:(12+22+32+.....n2)=16n(n+1)(2n+1)]

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