<span>Simplify the fractions if not in lowest terms.Multiply the numerators of the fractions to get the new numerator.<span>Multiply the denominators of the fractions to get the new denominator.</span></span>
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The number of ways of choosing 4 digits from 10 digits without replacement ( order is important) is
. This is the number of all possible permutations of choosing 4 from 10. The first 4 numbers of your phone number is a unique 4 digit number(4 different digits). The required probability is

Answer:
sorry
Step-by-step explanation: