Question

There are 5 red balls,6 white balls and 7 green balls in a box.If one ball is taken without looking,what is the probability that it is white?

Answer 1

5 + 6 + 7 = 18

6/18
1/3

1/3 chance

Answer 2

Probability = No. of favourable outcomes / no. of outcomes.
Thus,

$\alpha = \frac{6}{13}\\ \alpha = 0.46 \\ \\ Probability = 0.46$