Question

find the sum of 15 terms of AP 18,16,14.........​

Answer 1

Answer:

15th term is (-10)

Step-by-step explanation:

AP = 18,16,14

d= 16-18 = (-2)

n = 15 a=18

an = a+(n-1)d

a15 = 18+(15-1)(-2)

= 18+14(-2)

= 18-28

= -10

Answer 2

Answer:

Here is the answer =>

Step-by-step explanation:

A.P=18,6,14

a=18

d=-2

15th term=a+14d (a+(n-1)d) and n=15

So 15th term=18+14(-2)

=18+(-28)

=18-28

=-10

So the 15th term of the A.P 18,16,14...... is -10 which is the required answer.

HOPE IT HELPS.