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Question

(1072) = . (Evaluate using identities.)

A
11449
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B
11249
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C
16269
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D
18149
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Solution

The correct option is A 11449
Using the identity,
(a+b)2=a2+2ab+b2,
1072 = (100+7)2
= 1002+2× (100)× (7)+72
= 10000 + 1400 + 49
= 11449.

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