The number of terms in the series 101 + 99 + 97 + ........ + 47 is

The number of terms in the series 101 + 99 + 97 + ........ + 47 is
a) 25
b) 28
c) 30
d) 20

Answer is 28.
Total number of terms in an A.P. is = a + (n-1)d
so 47 = 101 + (n-1)-2
n = 28
so total number of terms in this series is 28, so B option is correct