Question

ab-a+b-1= _____________ 
a. (1-a)(1-b)
b. (1-a)(b-1)
c. (a+1) (b-1)
d. (a-1) (1-b)​

Answer 1

Answer:

C

Step-by-step explanation:

ab - a + b - 1

a(b - 1 ) +1(b - 1 )

( a + 2 )( b - 1 )

Answer 2

Step-by-step explanation:

this question's answer is option C