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2014-08-01T19:05:20+05:30

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If X divides 129 and leaves  a reminder 5
129 = n X + 5  for  some positive integer n
=>  n X = 124            X largest for n = 1.
So  X = 124

Similarly for others:
161 =  n X + 6  => n X = 155  =>  X = 155
Same way 224 = n X  + 7    =>  X  =  217


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this is not the ans which i am asking