The correct sequence is + 4, + 6, + 8, + 10, ............ So, next term after 29 = 29 + 12 = 41. The term after 41 will then be (41 + 14) i.e., 55. ∴ 41 is missing.
There are two series in the given question. 1st series: 1, 3, 5, 7, 9 ... ( each next term are generated by adding 2) 2nd series: 0, 2, 6, 12, 20 ... ( each next term are generated by adding 2n [where n=1,2,3,4...])