In Which of the following expressions prime factorization has been done: (a) 24=2x3x4 (b) 56=7x2x2x2 (c) 70=2x5x7 (d) 54=2x3x9

In expressions (b) and (c), prime factorization has been done.

Because, in (a) 4 is not a prime number and in (d) 9 is not a prime number.

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