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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
Options:
A .  34
B .  18
C .  28
D .  140
Answer: Option D
:
D
The only set of numbers possible = (2,3,6) (2,4,8) and (2,5,10)
thus required probability = 310C3 = 140

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