If b = a +c and b = 3 , then ab + bc =?
A
3
B
33
C
9
Correct Answer: 9
b = a + c, b = 3 so a + c = 3 বা, a = 3 - c এখন, ab + bc = 3a + 3c = 3(3 - c) + 3c = 9 - 3c + 3c = 9