Question

The odds of choosing one black ball from an urn are 7 to 13. what is the probability of getting a black ball?

Answer 1

I think the answer is 7/13.
Hope this helps.

Answer 2

Answer:
`(7)/(20)`

Explanation:

The odds for an event is basically the ratio of the favorable outcomes to the unfavorable outcomes.

Given : The odds of choosing one black ball from an urn are 7 to 13.

i.e. favorable outcomes for getting black ball = 7

i.e. unfavorable outcomes for getting black ball = 13

Now , Total outcomes = favorable outcomes+ unfavorable outcomes

=7+13=20

Then, the probability of getting a black ball
`=\frac{\text{Favorable outcomes}}{\text{Total outcomes}}`

`=(7)/(20)`

Hence, the required probability
`=(7)/(20)`