X is positive integer satisfying the following properties;
1)50<X<79
2)IF x is a multiple of 3 then 50<x<59
3)if x is not a multiple of 4 then 60<x<69
4)if x is not a multple of 6 then70<x<79
then what can we infer ?
answer is x=76
but im unable to get the logic
pls help
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