The probability that a random chosen three-digit number has exactly 3 factors is
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a
2225
b
7900
c
1800
d
none of these
answer is B.
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Detailed Solution
A number has exactly 3 factors if the number is squares of a prime number. Squares of 11, 13, 17, 19, 23, 29, 31 are 3-digit numbers. Hence, the required probability is 7900