Find the 15th term of an Ap 12, 15, 18 etc a=12 d=15-12=3 n = 15in this why we put n= 15?

Find the 15th term of an Ap 12, 15, 18 etc a=12 d=15-12=3 n = 15in thi

1.	Find the 15th term of an Ap 12, 15, 18 etc a=12 d=15-12=3 n = 15in this why we put n= 15?
Answer» We put n = 15 because the formula is a+(n-1)*d and here n refers to the No. Of terms