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Find the probability that a randomly chosenthree-digit number has exactly three factors.A. `2//225`B. `7//900`C. `1//800`D. none of these |
Answer» Correct Answer - B 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 `7//900`. |
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