Let A1, A2, A3, ..., An be narithmetic means between a and b, then A1 + A2 + A3 + ... + An = _____?

n(a + b)/2

n(a - b)/2

n(a ÷ b)/2

None of these

In an arithmetic progression, the sum of n terms between a and b is given by: Sum = n(a+b)/2

This formula uses the first and last terms to find the total of evenly spaced values.