Chapter Contents

Fundamental Theorem of Arithmetic

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Every number can be expressed as product of primes and this factorisation is unique, apart from the order in which the prime factors occur.


45 is a composite number.

It is expressed as:

\(45 = 3 \times 3 \times 5\)


Every number in maths can either be a prime or a composite number except 0 and 1 because 0 and 1 are neither a prime number nor a composite number.

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