If we calculate the differences between the terms we get a new sequence: 3, 5, 7, 9 which is a sequence in which each term is obtained by adding two to the previous term. Take for example the sequence: 2, 5, 10, 17, 26. The next term is therefore 96.Ĭompute the differences between the terms, which may be constant (above example) or lead us to another less complex sequence. For example, in the sequence: 3, 6, 12, 24, 48 each term is obtained by multiplying the previous term by 2. Note if each term can be obtained by adding, subtracting, multiplying or dividing the previous term by the same number. It is useful to know some basic sequences: sequences of integers, even numbers, odd numbers, multiplication tables, prime numbers, factorials, squares, power of numbers, etc. Sometimes you just look at the numbers and identify the pattern. To find the rule of a sequence, there are several practical tips. Sometimes sequences of numbers are combined with letters, in this case you should only take into account the position of the letter in the alphabet. In most cases you can find out a mathematical formula that describes how to compute each term of the sequence. Once that this rule or logical relationship is discovered, you can find out the next number of the sequence. This rule is based on the relationship all numbers have among them, which usually involve performing basic calculation such as addition, subtraction, multiplication and division. Numerical sequences are presented as a series of numbers arranged according to a logical rule. These tests assess the ability to solve arithmetical and mathematical problems, becoming a good measure of inductive and abstract reasoning.
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