KeerthanaPosted on 13 , 16, 21, 27, 39, 52, 69 a 21 b 27 c 39 d 52 e none of these Answer : Option BExplanation : 13 + 3 =16, 16 + 5 = 21, 21 + 7 = 28 + 11 = 39 27 is wrong no. Rate This:NaN / 5 - 1 votesAdd comment
