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Question

2xx13xx+1
Which of the following expressions is equivalent to the expression above?

A
xx21
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B
5xx2x21
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C
xx1
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D
6xx21
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Solution

The correct option is B 5xx2x21
Consider 2x(x1)3x(x+1) and taking L.C.M we get
2x(x+1)3x(x1)(x+1)(x1)
=(2x2+2x3x2+3x)(x+1)(x1)
=(5xx2)(x21)

Hence, option B is correct.

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