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Let a and b be two positive integers suc...

Let a and b be two positive integers such that `a= p^(3)q^(4)` and `b=p^2 q^3` , where p and q are prime numbers. If HCF (a,b) `= p^m q^n` and LCM(a,b) `= p^r,q^s`, then (m+n)(r+s) =

A

15

B

30

C

35

D

72

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