Question

find the number of terms in the finite A.P 7,13,19,.....151

Answer 1

here the difference is = 13-7 = 6

a= 7
d= 6

So, the series will be:
7, 13, 19, 25, 31, 37, 43,49,55,61,67, 73,79,85 ,91, 97, 103 ,109, 115,121, 127, 133, 139,145,151