Question

15. Which of the following is true? *

ab - a - b + 1 = (1-a) (1-b)
ab - a - b + 1 = (a-1) (b-1)
ab - a - b + 1 = (1-a) (b-1)
ab - a - b + 1 = (a-1) (1-b)​

Answer 1

Answer:

ab - a -b +1 = (a-1)(b-1) is true.

hope it will help you.

Answer 2

Answer:

ab-a-b+1=(a-1)(b-1)

Step-by-step explanation:

hope it's helps you .