Question

which of the following is not of natural number​

Answer 1

Answer:

2*5 - 5*2 ... ....... ...

Answer 2

Answer:

$7 + 9 - 8 = 16 - 8 = 8$

$2 \times 5 - 5 \times 2 = 10 - 10 = 0$

$15 + 20 \div 2 = 15 + 10 = 25$

$7 \times 6 \div 2 = 7 \times 3 = 21$

So 2nd one is not a natural number....xD