Question

4.

If a * b = a + b + (-1), where a and b are integers, then find the value of:
(1) 4 * 5
(ü) 5* (-7)
(ii) (-9) * 12​

Answer 1

Answer:

1.

4×5=4+5+(-1)=8

Bro the answer is coming wrong by using the formula