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21 March, 20:49

Dani says she is thinking of a secret number. As a clue, she says the number is the least whole number that has three different prime factors. What is Dani's secret number? What is its prime factorization?

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  1. 21 March, 23:15
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    List the first few prime numbers.

    2, 3, 5, 7, 11, 13, ...

    We want the product of the three lowest prime numbers to form the least whole number.

    2*3*5 = 30

    This the least whole number.

    Answer:

    The number is 30.

    It factors into 2, 3 and 5.
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