Question

write the value of a25-a15 ap6,9,12,15

Answer 1

Answer:

30

Step-by-step explanation:

a=6,d=3

a 25 = 25th term =>> a+(n-1)d

=>> 6+(25-1)3=78

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

=>> 6+(15-1)3=48

a25-a15 =78-48=30

Answer 2

Given:

AP = 6, 9, 12,15..

To Find:

the value of a25 - a15

Solution:

a = 6

d = 3

Now, to find the value,

a25 = 25th term

⇒ a + (n-1)d

⇒ 6 + (25-1)3

⇒ 6 + 72

⇒ 78

a15 = 15th term

⇒ a + (n-1)d

⇒ 6 + (15-1)3

⇒ 6 + 42

⇒ 48

So, a25 - a15 = 78 - 48

                      = 30

Therefore, the value of a25-a15 = 30.