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There are 10 marbles in a box which are ...

There are 10 marbles in a box which are marked with the distinct numbers from 1 to 10. If a marble is drawn, then what is the probability of getting a marble being a number multiple of 3 ?

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Multiples of 3 between 1 and 10 are 3, 6, and 9.
`:.` The required probability `=3//10`
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