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Question

If a=2+3 and b=23 then 1a21b2 is equal

A
14
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B
14
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C
83
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D
83
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Solution

The correct option is C 83
a=2+3 and b=23
1a21b2 = 1(2+3)2 1(23)2

= (23)2(2+3)2(2+3)2×(23)2

= 4×2×3(22(3)2)2

= 83(43)2

=83

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