Q21 of 66 Page 15

If three different coins are tossed together, then find the probability of getting two heads.[CBSE 2017]

Let H denote the event a head is obtained, T denote the event a tail is obtained

When three different coins are tossed together the sample spaces created are:


{(H,H,H),(H,H,T),(H,T,H),(T,H,H),(H,T,T),(T,H,T),(T,T,H),(T,T,T)}


Favorable outcomes of getting two heads =


{(H,H,T),(H,T,H),(T,H,H)}



Total number of favorable outcomes = 3


Total number of outcomes = 8


Answer: The Probability of getting two heads

More from this chapter

All 66 →
19

A card is drawn at random from a well shuffled pack of 52 playing cards. Find the probability of getting neither a red card nor a queen.[CBSE 2016]

 20

A number is chosen at random from the numbers −3,−2,−1,0,1,2,3. What will be the probability that square of this number is less than or equal to 1?[CBSE 2017]

 22

When two dice are tossed together, find the probability that the sum of numbers on their tops is less than 7.[CBSE 2011]

 23

Two dice are rolled together. Find the probability of getting such numbers on the two dice whose product is a perfect square. [CBSE 2011]