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Question

Let S=1+45+752+1053+, then the value of S is

A
298
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B
3316
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C
3516
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D
254
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Solution

The correct option is C 3516
S=1+45+752+1053+
This is AGP with a=1, r=15, d=3
S=a1r+dr(1r)2
=1115+3×15(115)2
=3516

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