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91, 85, 94, 83, 97, 81, (?), 79.
(a) 98
(b) 105
(c) 100
(d) 120
Solution:
In this series there are two groups of numbers.
91, 94, 97, (?)
and 85, 83, 81, 79.
In the first group add 3 to the numbers;
91 + 3 = 94
94 + 3 = 97
97 + 3 = 100
In the second group subtract 2 from the numbers;
85 – 2 = 83
83 – 2 = 81
81 – 2 = 79
Answer: 100
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