For an arithmetic progression, the nth term is given by: a + (n - 1)*d , where a is the first term and d is the common difference.

Here the first term is given as 2 and we have the fifth term as 14

So we have 14 = 2 + (5 - 1)*d

=> 14 = 2 + 4d

=> 14 - 2 = 4d

=> 12 = 4d

=> d = 3

**The required common difference is 3.**