LOGICAL AND CRITICAL REASONING PROBLEMS:Number Series

Part 7
31. 10 20 25 35 40 50 55
a. 70 65
b. 60 70
c. 60 75
d. 60 65
e. 65 70
32. 40 40 31 31 22 22 13
a. 13 4
b. 13 5
c. 4 13
d. 9 4
e. 4 4
33. 17 17 34 20 20 31 23
a. 26 23
b. 34 20
c. 23 33
d. 27 28
e. 23 28
34. 2 3 4 5 6 4 8
a. 9 10
b. 4 8
c. 10 4
d. 9 4
e. 8 9
35. 61 57 50 61 43 36 61
a. 29 61
b. 27 20
c. 31 61
d. 22 15
e. 29 22
Answers:

31. e. This is an alternating addition series, in
which 10 is added, then 5, then 10, and
so on.
32. a. This is a subtraction series with repetition.
Each number repeats itself and then
decreases by 9.
33. e. This is an alternating subtraction series with
repetition. There are two different patterns
here. In the first, a number repeats itself;
then 3 is added to that number to arrive at
the next number, which also repeats. This
gives the series 17, 17, 20, 20, 23, and so on.
Every third number follows a second pattern,
in which 3 is subtracted from each
number to arrive at the next: 34, 31, 28.
34. d. This is an alternating addition series with a
random number, 4, interpolated as every
third number. In the main series, 1 is added,
then 2 is added, then 1, then 2, and so on.
35. e. This is an alternating repetition series, in
which a random number, 61, is interpolated
as every third number into an otherwise
simple subtraction series. Starting with the
second number, 57, each number (except
61) is 7 less than the previous number.
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