LOGICAL AND CRITICAL REASONING PROBLEMS:Number Series

Part 13
61. Look at this series: 8, 43, 11, 41, __, 39, 17, . . .
What number should fill in the blank?
a. 8
b. 14
c. 43
d. 44
62. Look at this series: 15, __, 27, 27, 39, 39, . . .
What number should fill the blank?
a. 51
b. 39
c. 23
d. 15
63. Look at this series: 83, 73, 93, 63, __, 93, 43, . . .
What number should fill the blank?
a. 33
b. 53
c. 73
d. 93
64. Look at this series: 4, 7, 25, 10, __, 20, 16, 19, . . .
What number should fill the blank?
a. 13
b. 15
c. 20
d. 28
65. Look at this series: 72, 76, 73, 77, 74, __, 75, . . .
What number should fill the blank?
a. 70
b. 71
c. 75
d. 78
Answer:


61. b. This is a simple alternating addition and
subtraction series. The first series begins
with 8 and adds 3; the second begins with
43 and subtracts 2.
62. d. In this simple addition with repetition
series, each number in the series repeats
itself, and then increases by 12 to arrive at
the next number.
63. b. This is a simple subtraction series in which
a random number, 93, is interpolated as
every third number. In the subtraction
series, 10 is subtracted from each number to
arrive at the next.
64. a. Two series alternate here, with every third
number following a different pattern. In the
main series, 3 is added to each number to
arrive at the next. In the alternating series, 5
is subtracted from each number to arrive at
the next.
65. d. This series alternates the addition of 4 with
the subtraction of 3.
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