Question

If 1,2=23 2,3=25 3,4=127 4,5=209 Then what is 5,6=?

Answer 1

1,2=23    i.e    1*2 as the tens digit and 1+2 as ones digit

the same goes for all u may check

5,6=?

5*6=30        5+6=11

5,6=311 as tens digit of 1 carry overs to unit digit of 30