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Question
Using suitable identity, evaluate the following:
9992
Solution
9992 = (1000 – 1)2
= (1000)2 + (1)2 – 2 × 1000 × 1 ...[Using identity, (a – b)2 = a2 + b2 – 2ab]
= 1000000 + 1 – 2000
= 998001
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