Find the 2nd term and the rth term of an A.P. whose 6th term is 12 and 8th term is 22.

Let a be the first and d be the common difference
                          ...(i)
                        ... (ii)
Subtracting (ii) from (i), we get
                         -2d = -10                   or                       d = 5
using value of d in (i), we get
                  a + 5(5) = 12                    or                        a = 12 - 25 = -13