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Quantitative Aptitude

Probability

Set N consist...

Question

Set N consists of all natural numbers from 1 to 10. Three numbers are selected at random from this set. Find the probability that the product of two of the number is equal to the third

A

3/4

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B

1/8

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C

2/7

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D

1/40

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Solution

The correct option is D
1/40

The only set of numbers possible = (2,3,6) (2,4,8) and (2,5,10)
thus required probability = $\frac{3}{^{10} C_{3}}$ = $\frac{1}{40}$

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