In which of the following expressions, prime factorisation has been done?
(a) 24 = 2 × 3 × 4 (b) 56 = 7 × 2 × 2 × 2 (c) 70 = 2 × 5 × 7 (d) 54 = 2 × 3 × 9
Answer:
Checking part (a), 4 is not the prime number which means that given factorization is not the prime factorization.
Checking part (b), all the numbers are prime which means that given factorization is prime factorization.
Checking part (c), all the numbers are prime which means that given factorization is prime factorization.
Checking part (d), 9 is not the prime number which means that given factorization is not the prime factorization.
Therefore, the answer is (b) and (c).
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