Find the sum of the first 15 terms of the series 3 + 5 + 7 + 9 +. . . . . . n terms.___
Given Series is an AP
Sum of n terms of an AP if first term = 3 and common difference = 2
Sn = n2 (2a + (n – 1)d)
S20 = 152( 6 + 14 × 2) = 255
Find the sum of the first 15 terms of the series 3 + 5 + 7 + 9 +. . . . . . n terms.
Find the sum of the series : 3 + 5 + 7 + 6 + 9 + 12 + 9 + 13 + 17 + .... to 3n terms.