Question

1/15,1/12,1/10……..to 11 terms find arthimetic progression

Answer 1

a (first term) = 1/15
      d (common difference) = 1/10 – 1/12 =
        1/12 – 1/15 = 1/60
      n (no. of terms) = 11
      Using the formula we have 
      an = a+(n-1)d
     hence, 
            a11 = a+(n-1)d
                 = 1/15 + (11-1) 1/60
                  = 1/15 + (10)1/60
                  = 1/15 + 1/6
                  = 2+5/30
                   =7/30
Thus 11­th term is 7/30.