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Of the three-digit numbers formed from the digits 1 to 9, without repeats, I select one at random. Determine the following probabilities: (a) Prob (my

Of the three-digit numbers formed from the digits 1 to 9, without repeats, I select one at random.

Determine the following probabilities:

(a) Prob (my number is 420)

(b) Prob (my number begins with an even digit or ends with an even digit)

Leave your probabilities as fractions in simplest form.

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