LOGICAL AND CRITICAL REASONING PROBLEMS:Letter and Symbol Series

Part 15
71. Look at this series: J14, L16, __, P20, R22, . . .
What number should fill the blank?
a. S24
b. N18
c. M18
d. T24
72. Look at this series: F2, __, D8, C16, B32, . . .
What number should fill the blank?
a. A16
b. G4
c. E4
d. E3
73. Look at this series: V, VIII, XI, XIV, __, XX, . . .
What number should fill the blank?
a. IX
b. XXIII
c. XV
d. XVII
74. Look at this series: XXIV, XX, __, XII, VIII, . . .
What number should fill the blank?
a. XXII
b. XIII
c. XVI
d. IV
75. Look at this series: VI, 10, V, 11, __, 12, III, . . .
What number should fill the blank?
a. II
b. IV
c. IX
d. 14
Answers:

71. b. In this series, the letters progress by 2, and
the numbers increase by 2.
72. c. The letters decrease by 1; the numbers are
multiplied by 2.
73. d. This is a simple addition series; each number
is 3 more than the previous number.
74. c. This is a simple subtraction series; each
number is 4 less than the previous number.
75. b. This is an alternating addition and subtraction
series. Roman numbers alternate with
Arabic numbers. In the Roman numeral
pattern, each number decreases by 1. In the
Arabic numeral pattern, each number
increases by 1.
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