LOGICAL AND CRITICAL REASONING PROBLEMS:Number Series

Part 3
11. Look at this series: 31, 29, 24, 22, 17, . . . What
number should come next?
a. 15
b. 14
c. 13
d. 12
12. Look at this series: 21, 9, 21, 11, 21, 13, . . .
What number should come next?
a. 14
b. 15
c. 21
d. 23
13. Look at this series: 53, 53, 40, 40, 27, 27, . . .
What number should come next?
a. 12
b. 14
c. 27
d. 53
14. Look at this series: 2, 6, 18, 54, . . . What number
should come next?
a. 108
b. 148
c. 162
d. 216
15. Look at this series: 1,000, 200, 40, . . . What
number should come next?
a. 8
b. 10
c. 15
d. 20
Answers:


11. a. This is a simple alternating subtraction
series, which subtracts 2, then 5.
12. c. In this alternating repetition series, the random
number 21 is interpolated every other
number into an otherwise simple addition
series that increases by 2, beginning with
the number 9.
13. b. In this series, each number is repeated, then
13 issubtracted to arrive at the next number.
14. c. This is a simple multiplication series. Each
number is 3 times more than the previous
number.
15. a. This is a simple division series. Each number
is divided by 5.
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