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Answer

Correct Option is 15

Odd number is followed by a perfect square so =5- 4= 1
Odd number is followed by an odd number so = 1 + 15 = 16(sum of row)
Odd number is followed by a perfect square so =21- 16 = 5
Odd number is followed by a perfect square so = 5 -4 =1(sum of row 2)
So the difference is = 16 – 1 = 15

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