Question

What is the first term of the AP,-11,-8,-5

Answer 1

Given:

d ( common difference ) = -3

an ( Last Term ) = -5

n ( No. of terms ) = 4

To Find:

The first term of the AP (a).

Formula:

an = a + ( n - 1 )d

Solution:

By putting the values, we get

-5 = a + ( 4 - 1 )-3

or, -5 = a + 9

or, -5 - 9 = a

or, -14 = a

Answer:

The first term of the AP is -14.