6. PQRS is a rectangle such that PR + PQ = 5PS and PR - PS = 8. Then area (in sq. units) of rectangle is- (A) 40 (B) 50 (C) 60 (D) 70

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( b 4+a^{2}+1 b a=left(16 a^{2}+b 4-b 4 a+a^{2}right) )

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