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Add 1 on both sides. We get...1+m+n+mn=119 (1+m)(1+n)=119 (1+m)(1+n)=17 *7 As 17 and 7 are prime we get 17 and 7 are the only factors of 119 1+m=17 M=16 1+n=7 N=6 M+n=22 Hope it helped u
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