If a and b are odd numbers, then which of the following is even ?
A
a + b + ab
B
a + b - 1
C
a + b + 1
D
a + b + 2ab
Correct Answer: a + b + 2ab
a + b + 2ab is evenExplanation : Sum of two odd number is even number and multiplication of two odd number with 2 always given an even number.
Alternate :
Put , a = 3, b = 5, option (D) will satisfy