Question

The 15 th term of the AP: 4,1-2,-5-8.......is

Answer 1

Solution:

Given :

• AP : 4, 1 , -2 , -5 , -8

Find first term of AP:

First term ( a) = 4

Find common Difference of AP:

Common difference = 1 - 4

common Difference = -3

Tn = a + (n-1)d

T15 = 4 + ( 15 -1)-3

T15 = 4 + 14(-3)

T15 = 4 + ( -42)

T15 = 4 - 42

T15 = -38

Therefore, 15th term of AP is -38.