Find the number that fits somewhere into the middle of the series. Some of the items involve both numbers and letters
1.
Look at this series: F2, __, D8, C16, B32, … What number should fill the blank?
A. A16 B. G4
C. E4 D. E3
Answer & Explanation
Answer: Option C
Explanation:
The letters decrease by 1; the numbers are multiplied by 2.
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2.
Look at this series: 664, 332, 340, 170, ____, 89, … What number should fill the blank?
A. 85 B. 97
C. 109 D. 178
Answer & Explanation
Answer: Option D
Explanation:
This is an alternating division and addition series: First, divide by 2, and then add 8.
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3.
Look at this series: V, VIII, XI, XIV, __, XX, … What number should fill the blank?
A. IX B. XXIII
C. XV D. XVII
Answer & Explanation
Answer: Option D
Explanation:
This is a simple addition series; each number is 3 more than the previous number.
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4.
Look at this series: 70, 71, 76, __, 81, 86, 70, 91, … What number should fill the blank?
A. 70 B. 71
C. 80 D. 96
Answer & Explanation
Answer: Option A
Explanation:
In this series, 5 is added to the previous number; the number 70 is inserted as every third number.
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5.
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
Answer & Explanation
Answer: Option B
Explanation:
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.