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Question

Find the value of (1x+y)(a+b)(1y−x)−(p+q)(1x−y)−(p+q)(x+1y)(a+b)

A
(xy)(a+b)+(p+q)
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B
(yx)(a+b)+(p+q)
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C
(yx)(a+b)(p+q)
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D
(xy)(a+b)(p+q)
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Solution

The correct option is D (yx)(a+b)+(p+q)
Let a=(1x+y)(a+b)(1yx)(p+q)(1xy)(p+q)(x+1y)(a+b)

=⎜ ⎜ ⎜1x+yx+1y⎟ ⎟ ⎟a+b⎜ ⎜ ⎜1yx1xy⎟ ⎟ ⎟(p+q)

=(yx)a+b(xy)(p+q)

=(yx)a+b(yx)p+q

a=(yx)(a+b)+(p+q)

(1x+y)(a+b)(1yx)(p+q)(1xy)(p+q)(x+1y)(a+b)=(yx)(a+b)+(p+q)

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