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91. 70, 71, 76, __, 81, 86, 70, 91. What number should fill the blank?
Solution:
In this series, 5 is added to the previous number; the number 70 is inserted as every third number.
92. 8, 43, 11, 41, __, 39, 17. What number should fill in the blank?
Solution:
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.
93. VI, 10, V, 11, __, 12, III. What number should fill the blank?
Solution:
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.
94. (1/9), (1/3), 1, ____ , 9. What number should fill the blank?
Solution:
This is a multiplication series; each number is 3 times the previous number.
95. 83, 73, 93, 63, __, 93, 43. What number should fill the blank?
Solution:
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.
96. 15, __, 27, 27, 39, 39. What number should fill the blank?
Solution:
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.
97. 72, 76, 73, 77, 74, __, 75. What number should fill the blank?
Solution:
This series alternates the addition of 4 with the subtraction of 3.
98. J14, L16, __, P20, R22. What number should fill the blank?
Solution:
In this series, the letters progress by 2, and the numbers increase by 2.
99. 4, 7, 25, 10, __, 20, 16, 19. What number should fill the blank?
Solution:
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.
100. XXIV, XX, __, XII, VIII. What number should fill the blank?
Solution:
This is a simple subtraction series; each number is 4 less than the previous number.