5,9,18,30,50,__
Options:
(A) 79
(B) 80
(C) 81
(D) 82
(E) 83 Now, let's think a bit. Some random thoughts:
(9+5) +4 = 18
(16+9) +5 = 30
(28+16)+6 = 50
(48+28)+7 = 83
The final answer: (E).