Question

complete la siguiente serie ... o,12,u,15,a,18,e,21

Answer 1

1) 0, 1, 2, 3, 3, 4, 4, 4, 4, 5, ? 2) 53, 68, 116, 122, 126, 138, ? 3) 1, 4, 9, 15, ? 4) 3, 3, 4, 6, 5, 4, ? 5) 1, 2, 4, 8, 16, 22, 24, 28, ? 6) 1, 2, 4, 9, 61, 52, 63, 94, ? 7) 261=1, 602=2, 893=3, 1884=4, 2375=?