Question

three numbers are in AP if second term is 4 then find the sum of three terms​

Answer 1

a+d=4

a+a+d+a+2d=?

3(a+d)=?

3x4

=>12

ans!

Answer 2

Answer:

Let the first term be a,

then A.P: a, a+d, a+2d

Sum of these three terms = 3a + 3d = 3(a+d) (eq.1)

Given, a + d = 4,

Then, the sum of first three terms is also equal to:

3 (4) = 12.