If 51, 59, 67, 75, ... is an A.P., then its common difference is

The correct answer is Option (2) → 8

In an arithmetic progression every term exceeds the one before it by the same amount, the common difference \(d=a_2-a_1\).

• \(d=59-51=8\)

• The later terms keep the same gap: \(67-59=8\) and \(75-67=8\)