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Odd one out

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which  of the following number sets is differernt from rest three

1) {3,7,11,23}

2){11,31,13,43}

3){7,31,21,37}

4){5,13,17,29}
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Option 1,2 and 4 all contains set of prime numbers but in option 3 we have 21 i.e not prime so different option is 3 only.
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