LOGICAL AND CRITICAL REASONING PROBLEMS:Number Series

Part 11
51. 13 29 15 26 17 23 19
a. 21 23
b. 20 21
c. 20 17
d. 25 27
e. 22 20
52. 16 26 56 36 46 68 56
a. 80 66
b. 64 82
c. 66 80
d. 78 68
e. 66 82
53. 7 9 66 12 14 66 17
a. 19 66
b. 66 19
c. 19 22
d. 20 66
e. 66 20
54. 3 5 35 10 12 35 17
a. 22 35
b. 35 19
c. 19 35
d. 19 24
e. 22 24
55. 36 31 29 24 22 17 15
a. 13 11
b. 10 5
c. 13 8
d. 12 7
e. 10 8
Answers:


51. b. Here, there are two alternating patterns,
with every other number following a different
pattern. The first pattern begins with 13
and adds 2 to each number to arrive at the
next; the alternating pattern begins with 29
and subtracts 3 each time.
52. c. Here, every third number follows a different
pattern from the main series. In the main
series, beginning with 16, 10 is added to
each number to arrive at the next. In the
alternating series, beginning with 56, 12 is
added to each number to arrive at the next.
53. a. This is an alternating addition series with
repetition, in which a random number, 66,
is interpolated as every third number. The
regular series adds 2, then 3, then 2, and so
on, with 66 repeated after each “add 2” step.
54. c. This is an alternating addition series, with a
random number, 35, interpolated as every
third number. The pattern of addition is to
add 2, add 5, add 2, and so on. The number
35 comes after each “add 2” step.
55. e. This is an alternating subtraction series,
which subtracts 5, then 2, then 5, and so on.
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