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Find m and n if P(m+n,2)=56,P(m-n,2)=12 |
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Answer» SOLUTION :`""^(m+n)P_2=56,""^(m-n)P_2=12` `or,((m+n)!)/((m-n-2)!)=12` `or,(m+n)(m+n-1)=8xx7`(m-n)(m-n-1)=4xx3` `:. (m+n)=8 ,m-n=4` `:. M=6,n=2` |
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