ProbabilityHard
Question
A coin is tossed indefinitely. Probability that the fourth head occurs before the sixth toss is equal to -
Options
A.1/16
B.2/16
C.3/16
D.4/16
Solution
First five tosses must contain either 4H + 1T or 5H
⇒ Required probability = P(4H + 1T) + P(5H)
= 5C4 ×
⇒ Required probability = P(4H + 1T) + P(5H)
= 5C4 ×
Create a free account to view solution
View Solution FreeMore Probability Questions
Two real numbers, x & y are selected at random. Given that 0 ≤ x ≤ 1 ; 0 ≤ y ≤ 1. Let A be the e...A five digit number with distinct digits is formed by using the digits 0, 1, 2, 3, 4, 5. The probability that the number...The probability of not getting tail in the first two times and getting a tail in the third time by tossing a coin contin...A man and a woman appear in an interview for two vacancies in the same post. The probability of man′s selection is...The probability that a random arrangement of letters i,i,i,t,t,n,n,o,a,v in row result in a word ″Invitation″...