Q5 of 176 Page 8

Find the number of terms in the following A.P.'s

Here,



And


We have,


l = a + (n – 1)d





⇒ 15 = n – 1


⇒ n = 16


Hence, the number of terms in the given AP is 16.


More from this chapter

All 176 →
4

Find the sum of 20th and 25th terms of A.P. 2, 5, 8, 11, ...

 5

Find the number of terms in the following A.P.'s

6, 3, 0, — 3,…..,–36

 6

Determine the number of terms in the A.P. 3, 7, 11, ..., 399. Also, find its 20th term from the end.

 7

Which term of the A.P. 5, 9, 13, 17, ... is 81?