A sequence is an ordered list of items, usually numbers, called terms. Describing sequences involves expressing the general term as the nth term written as Tn. Linear sequences can be written as a general formula to calculate any term using the common difference d, which is the difference between any term and the term before it, written as d=Tn−T(n−1).

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3. Number patterns
Grade 10

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Sequences
A sequence is an ordered list of items, usually numbers. Each item which makes up a
sequence are called 'terms'.

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Describing sequences
● The general term is often expressed as the nth
term and is written as Tn
.
● Linear sequences can be written as a general formula, which is used to calculate any term
in the sequence.
● The common difference (d) is the difference between any term and the term before it.
d=Tn−T(n−1)

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