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Question

107×107+93×93=?

A
19578
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B
19418
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C
20098
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D
21908
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E
None of these
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Solution

The correct option is E 20098
107×107+93×93=1072+932
=(100+7)2+(1007)2
=2×[(100)2+72] ...................... [Ref: (a+b)2+(ab)2=2(a2+b2)]
=20098

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