Express the sum using summation notation Use 1 as the lower

Express the sum using summation notation. Use 1 as the lower limit of summation and I for the 1/4 + 2/5 + 1/2 +. .. + 10/15 summation^10_i=1 i/I + 3 summation^n_i=1 i/1 + 3 summation^10_i=0 1 i/1 + 3 summation^10_i=3 i/I + 1

Solution

9) ¼ + 2/5 + ½ + ………. 10/13 = sum(i/i + 3)   (i = 0 to 10) [option A]

10) a_n = a₁ + (n 1)*d

      a₈₀ = -14 + 79*3 = 223 (option D)