If three numbers a, b, and c are in an A.P, then which of the following is/are the arithmetic mean between a and c?
a+c2
b
If three numbers a, b and c are in an A.P., then b is the arithmetic mean between a and b.
Since a, b, and c are in A.P, b - a = c - b i.e., b = c+a2.
Hence both option (b) and option (c) are correct.