Question 1196823
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Without restrictions, there are 10 possibilities for the first digit.<br>
With the restriction, there is only 1 possibility: the first digit must be 3.<br>
So the probability that the first digit is 3 is 1/10.<br>
And after the first digit there are no further restrictions; the probability is 1 that the last three digits satisfy the conditions.<br>
ANSWER: (1/10)*1 = 1/10<br>