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A bag contains 12 marbles out of which $y$ are white. If one marble is drawn at random from the bag, what is the probability that it will be white marble?

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y 12

12 y

None

answer is A.

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Detailed Solution

Given that the bag contains 12 marbles. And in this number of white marbles is

.
We know, the probability of an event is calculated by dividing the number of favorable outcomes by total number of outcomes.
There are y white marbles.
If one marble is drawn at random from the bag, the probability that it will be white marble =

y 12

.
Therefore, option 1 is correct.

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