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Question

Factorize :
12a2b3(a+b)2.

A
(13ab)(1a+b)
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B
(13a3b)(1+a+b)
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C
(1a3b)(1+a+b)
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D
(13ab)(1+a+b)
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Solution

The correct option is B (13a3b)(1+a+b)
12a2b3(a+b)2
=3(a+b)22(a+b)+1
=3(a+b)23(a+b)+(a+b)+1
=3(a+b)((a+b)+1)+((a+b)+1)
=((a+b)+1)(13(a+b))
=(a+b+1)(13a3b)

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