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How to Pass Professional Level Psychometric Tests, 3rd Edition by Sam Al-Jajjoka

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Number series

This type of test is popular and used extensively in recruitment to test basic numerical reasoning abilities. The test consists of a sequence of numbers and your task is to find out the pattern and progression of the sequences, then find the number to replace the question mark (?) in the sequences, by selecting one from four provided choices, as illustrated below:

Example 1

In this sequence each number is increased by multiplying by 2:

9 (×2) = 18 (×2) = 36 (×2) = ? = 72, therefore the answer is A.

Example 2

In this sequence the two ...

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