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Q.

Which factors are not included in the prime factorisation of a composite number?

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a

1

b

1 and the number itself

c

2

d

2 and 3

answer is B.

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Detailed Solution

The prime factors of the number 16 can be written as,
16 = 2 × 2 × 2 × 2
The prime factors of the number 20 can be written as,
20 = 2 × 2 × 5
From the above examples, we observe that 1 and the number itself are not included in the prime factorisation of the number 16 and 20(composite number).
Hence, 1 and the number itself are not included in the prime factorisation of a composite number.
Therefore, option 2 is correct.

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