Question

what is the 15th term of AP WHOSE 1ST TERM IS EQUAL TO ITS COMMON DIFFERENCE AND WHOSE 3RD TERM IS 9

Answer 1

Answer:

I hope u will find ur answer plz mark brainliest answer

Answer 2

Answer:

45 is the correct answer

Given:

the first term of an AP = common difference

the third term of the AP = 9

To find:

the 15th term of AP

Solution:

a (n) = a+(n-1)d

n = number of terms

d = common difference

a = first term

now, we know that,

a = d

And, a+2d = 9

so,

3d = 9

d = 3

Then,

a = d =3

putting in the formula,

a15 = a+(n-1)d

a15 = 3+(14)(3)

a15 = 45

Hence, 45 is the correct answer.

5 is the correct answer. #SPJ2