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The arithmetic mean or the "mean"between two numbers is sometimes called the AVERAGE of two numbers.

find it out by this method

let common difference is d

17 = 3 + 7d

d = 2

A1 = 3+2 = 5

A2 = 5+2 = 7

A3 = 7+2 = 9

A4 = 9+2 = 11

A5 = 11+2 = 13

A6 = 13+2 =15