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I solved it by taking matrix ,I am confused in commutative 

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Total no of elements = $n^2$

no of diagonal elements = n

so total no of non diagonal elements = $n^2$ - $n$

half of them will be commutative to other half=> ($n^2$ - $n$ $)/$$ 2 $

option b?

 

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Options:10, 12,14, 16, 18, 2020, 18, 16, 14, 12, 1012, 10, 16, 14, 20, 18NONE