Advertisements
Advertisements
Question
There coins are tossed simultaneously . what is the probability of getting atleast two heads?
Solution
If three coins are tossed then possible outcomes are :
HHH , HHT , HTH , THH , HTT , THT , TTH , TTT
So total number of outcomes = 8
Favorable out comes for getting at least 2 heads are :
HHH , HHT , HTH , THH
So number of favorable outcomes = 4
Thus , P(Getting at least 2 heads) = `"Number of favourable outcomes"/"Total number of outcomes"` = `4/8` = `1/2`
APPEARS IN
RELATED QUESTIONS
A game of numbers has cards marked with 11, 12, 13, ....., 40. A card is drawn at random. Find the probability that the number on the card drawn is a perfect square.
From a pack of 52 playing cards all cards whose numbers are multiples of 3 are removed. A card is now drawn at random.
1) a face card (King, Jack or Queen)
2) an even-numbered red card
Cards marked with numbers 1, 2, 3, 4… 20 are well shuffled and a card is drawn at random. What is the probability that the number on the card is:
(1) A prime number,
(2) A number divisible by 3,
(3) A perfect square?
Which of the following cannot be the probability of an event?
–3.2
A die is thrown once. Find the probability of getting a number greater than or equal to 4.
A ball is drawn at random from a box containing 12 white, 16 red and 20 green balls. Determine the probability that the ball drawn is white.
In a match between A and B; the probability of losing the match is 0.49 for B. What is the probability of winning of A?
All the three face cards of spades are removed from a well-shuffled pack of 52 cards. A card is then drawn at random from the remaining pack. Find the probability of getting a black card.
The probability that two boys do not have the same birthday is 0.897. What is the probability that the two boys have the same birthday?
A bag contains a red ball , a blue ball and a yellow ball , all the balls being of the same size . Anjali takes out a ball from the bag without looking into it . what is the probability that she takes out .
(iii) blue ball?
