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If $m + n_{P_{2}} = 90$ and $^{m - n} P_{2} = 30,$ then $(m, n)$ is equal to

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Correct option is B

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

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If $m + n_{P_{2}} = 90$ and $^{m - n} P_{2} = 30,$ then $(m, n)$ is equal to