Thirty days are in September, April, June and November. Some months are of thirty one days. A month is chosen at random.
Then its probability of having exactly three days less than maximum of 31 is
Number of days in February = 28
Number of months having three days less than 31 i.e, 28 days = 1
$$\therefore\ $$Required probability = $$\frac{1}{12}$$
Hence, the correct answer is Option D
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