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Question

The value of expression 2+12×2×2+1×1×1 is equal to

A
12
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B
13
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C
15
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D
11
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Solution

The correct option is B 13
On taking a = 2 and b = 1, the given expression becomes

a+ba3+b3
= a+b(a+b)(a2ab+b2)
= 1(a2ab+b2)
= 1(222×1+12)
=1(42+1)
=13

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