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In which of the following expressions, p...

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

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1 and 4 are not prime factors
2 and 3 are prime factors.
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