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Number Series - Aptitude Questions and Answers - RejinpaulPlacement

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In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much

1.
Look at this series: 8, 6, 9, 23, 87 , ... What number should come next?
Answer & Solution
Answer: (D) 429

Solution: 8 x 1 - 2 = 6
6 x 2 - 3 = 9
9 x 3 - 4 = 23
23 x 4 - 5 = 87
87 x 5 - 6 = 429 ...
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2.
Look at this series: 5.2, 4.8, 4.4, 4, ... What number should come next?
Answer & Solution
Answer: (D) 3.6

Solution: In this simple subtraction series, each number decreases by 0.4.
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3.
Look at this series: 2, 6, 18, 54, ... What number should come next?
Answer & Solution
Answer: (C) 162

Solution: This is a simple multiplication series. Each number is 3 times more than the previous number.
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4.
Look at this series: 80, 10, 70, 15, 60, ... What number should come next?
Answer & Solution
Answer: (A) 20

Solution: This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.
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5.
Look at this series: 544, 509, 474, 439, ... What number should come next?
Answer & Solution
Answer: (A) 404

Solution: This is a simple subtraction series. Each number is 35 less than the previous number.
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