what is the rule of 5*6=
if
2*3= 7
1*6=8
There can be many different answers. The following is just one of the possible answers.
If we interpret a*b≡2a+b, where + takes the usual meaning, and * is a defined operator, then
2*3=2(2)+3=7
1*6=2(1)+6=8
so
5*6=2(5)+6=16