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Q.

If m+nP2=90 and  m−nP2=30, then (m,n) is equal to

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a

(12, 8)

b

(8, 2)

c

(6, 4)

d

(7, 4)

answer is B.

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Detailed Solution

(m+n)(m+n−1)=90 and (m−n)(m−n−1)=30⇒m+n=10,m−n=6∴m=8,n=2
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