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Question

The largest perfect square that divides 2014320133+2012320113+....+2313 is.

A
12
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B
22
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C
10072
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D
20142
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Solution

The correct option is D 10072
S=2014320133+2012320113+....+2313
2014r=1r2=1007r=1(2r1)(2r)
S=2014r=1r2+1007r=1(4r22r)
S=(2014)(2015)(4029)6+4×1007×1008×201562×1007×10082=(1007)2×4031

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