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FInd the odd one out

Answer:

Explanation:

The given numbers are in binary system by converting these into the decimal system we get 

$1011= 1\times 2^{3} +0\times 2^{2}+1\times 2^{1}+1\times 2^{0}$

$1101=8+4+1=13$

$1111=8+4+2+1=15$

$10001=16+0+0+0+1=17$

All the given numbers except 15 are prime numbers