Question

The sum of 3rd and 15th elements of an arithmetic progression

Answer 1

a+2d + a+14d this is the equation for the question and substitute the values

Answer 2

Explanation:

If we consider the third term to be ‘x”

The 15th term will be (x + 12d)

6th term will be (x + 3d)

11th term will be (x + 8d) and

13th term will be (x + 10d).

Thus, as per the given condition, 2x + 12d = 3x + 21d.Or x + 9d = 0.

x + 9d will be the 12th term.

Thus, 12th term of the A.P will be zero. (hope you understoof please mark me as branliest..)