Advertisements
Advertisements
Question
An urn contains 10 red and 8 white balls. One ball is drawn at random. Find the probability that the ball drawn is white.
Solution
\[\text{ Number of red balls } = 10\]
\[\text{ Number of white balls }= 8\]
\[\text{ Total number of balls in the urn } = 10 + 8 = 18\]
\[\text{ Therefore, the total number of cases is 18 and the number of favourable cases is 8 }. \]
\[ \therefore P\left( \text{ The ball drawn is white }\right) = \frac{\text{ Number of favourable cases }}{\text{ Total number of cases }} = \frac{8}{18} = \frac{4}{9}\]
APPEARS IN
RELATED QUESTIONS
Tell whether the given is certain to happen, impossible, can happen but not certain.
Tomorrow will be a cloudy day.
In a simultaneous throw of a pair of dice, find the probability of getting:
a sum less than 7
Three coins are tossed together. Find the probability of getting:
at least one head and one tail
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is:
either a black card or a king
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is:
a heart
A bag contains 3 red balls, 5 black balls and 4 white balls. A ball is drawn at random from the bag. What is the probability that the ball drawn is:
red?
If you have a collection of 6 pairs of white socks and 3 pairs of black socks. What is the probability that a pair you pick without looking is
white?
A card is drawn at random from a pack of 52 cards. Find the probability that the card drawn is:
a red card
What is the probability of choosing a vowel from the alphabets?
A glass jar contains 6 red, 5 green, 4 blue and 5 yellow marbles of same size. Hari takes out a marble from the jar at random. What is the probability that the chosen marble is of red colour?
