Question

we say that a×b is ab then y dont we say that 1×3 is 13

Answer 1

Answer:

because a and b are not defined in nos. if their numeral value is given then they will multiply like other nos. mutiply.

Answer 2

Hii mate....

axb=ab

because a, b are the unknown variables

but 1x3=3

because 1,3are the know numbers....

I think this will help you