21-Find the missing number.
8, 54, 192, ?, 1080
(A) 250
(B) 500
(C) 780
(D) 926
22-Find the missing number.
12, 15, 13, 16, 14, ?
(A) 12
(B) 13
(C) 15
(D) 17
23-Find the missing number.
-5, 5, 15, 25, ?
(A) 30
(B) 35
(C) 40
(D) 45
24-Find the missing number: 4, 9, 25, 49, 121, ___ .
(A) 147
(B) 169
(C) 182
(D) 215
25-Find the missing number.
3, 9, 15, 21, ?
(A) 22
(B) 25
(C) 27
(D) 29
26-Look at this series: 4, 16, 256, ?
What should come in place of ‘?’ mark?
(A) 65536
(B) 1536
(C) 2304
(D) 60416
ANSWERS:
21-(B), 22-(D), 23-(B), 24-(B), 25-(C), 26-(A)