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Questions  

The value of (2+1)5+(21)5 , is 

a
58
b
582
c
42
d
422

detailed solution

Correct option is B

Using binomial expansion, we have (2+1)5+(2−1)5=2(2)5+10(2)3+52(2+1)5+(2−1)5=2{42+202+52}=582

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