Question

If the probability of white ball from the
box is thrice that of a black ball and a
box contains 12 black balls and some
white balls. Then, find the number of
white balls in the box.
ps: A.
4​

Answer 1

Answer:

let the total no. of balls in the box be x

probability of getting a black ball = 12/x

probability of getting a white ball = 3 * (12/x) = 36/x

total probability = 1

1 = 36/x + 12/x

1 = 48/x

x = 48

therefore, the total no. of balls in the box is 48.

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