Sequence

Sequence: A sequence {a_n} is a function whose domain is the set of positive integers.

Terms of a sequence: The functional values a₁, a₂, a₃, … a_n of a sequence {a_n}are called the terms of the sequence.

Factorial notation: Factorial notation is “n!”. We read it by saying “n factorial”.

It is defined for any positive integer as n * (n-1) * (n – 2) * …. * 3 * 2 * 1.

0! is defined as 0! = 1.

Notice that n! = n * (n – 1)!

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