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Multiple Choice Questions
1. Simplify: (213 x 213 + 187 x 187)
(A): 80338
(B): 80438
(C): 60338
(D): 60438
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By: anil on 05 May 2019 02.08 am
Expression : $$(213 imes213+187 imes187)$$ = $$(200+13)^2+(200-13)^2$$ = $$[(200)^2+(13)^2+2(200)(13)]+[(200)^2+(13)^2-2(200)(13)]$$
= $$[2 imes(200)^2]+[2 imes(13)^2]$$ = $$80000+338=80338$$ => Ans - (A)
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SSC CHSL 4 March 2018 Evening Shift
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= $$[2 imes(200)^2]+[2 imes(13)^2]$$ = $$80000+338=80338$$ => Ans - (A)