Question

For the A.P3,1,-1,-3 the common difference is ____________​

Answer 1

Common diference (d) = second term (a2)- first

term(a1) = 1-3 = -2

∴ Common difference(d) = -2

Answer 2

Answer: d1 = a2 - a1

                   = 1 - 3

                   = -2

              d2 = a3 - a2

                   = -1 -1

                   = -2

              d1 = d2 = -2

              = d = -2

           HOPE IT HELPS !!