## Jagat Chaudhary is teaching live on Unacademy Plus

IIT-JEE (main +Advanced) Probability On

Probability

Probability: Probability of occurrence of an event A is denoted by P(A) is given by

Probability:Probability of occurrence of an event A is denoted by P(A) is given by n(A)

Probability: Probability of occurrence of an event A is denoted by P(A) is given by P(A)(S) Ques: Find probability of getting exactly two tails when 2 coins are tossed.

Probability: Probability of occurrence of an event A is denoted by P(A) is given by P(a) A) m(S) Ques: Find probability of getting exactly two tails when 2 coins are tossed. P(A) n41 n(S) 4

Probability:Probability of occurrence of an event A IS denoted by P(A) is given by P(a) CA) m(S) Ques: Find probability of getting exactly two tails when 2 coins are tossed. n(A) 1 n(S) 4 P(A)S Ques: Find probability of getting Atmost one Head when 2 coins are tossed

Probability: Probability of occurrence of an event A is denoted by P(A) is given by P(A)(S) n(A) Ques: Find probability of getting exactly two tails when 2 coins are tossed. P(A)A n(A) 1 Ques: Find probability of getting Atmost one Head when 2 coins are tossed. n(A) 3

Addition theorem of probability:

Addition theorem of probability: If 'A' and 'B' are any two events associated with an experiment, then P(AuB) P(A) P(B) P(AnB) De Morgan's laws : If A & B are two subsets of a universal set U, then

Ques: An old man while dialing a seven digit phone number. After having dialed the first 5 digits, suddenly forgets the last two but he remembered that the last two digits were different. What is the probability that Correct phone number will be dialed Sol: We have to check possibility for last two digits

Ques: An old man while dialing a seven digit phone number. After having dialed the first 5 digits, suddenly forgets the last two but he remembered that the last two digits were different. What is the probability that Correct phone number will be dialed Sol: We have to check possibility for last two digits total possible outcomes or Sample space have n(S)-10x9-90 Correct outcomes n(A)-1 hence P(A)- n(S)

Ques: An old man while dialing a seven digit phone number. After having dialed the first 5 digits, suddenly forgets the last two but he remembered that the last two digits were different. What is the probability that Correct phone number will be dialed. Sol: We have to check possibility for last two digits total possible outcomes or Sample space have n(S)-10x9-90 Correct outcomes n(A)-1 hence P(A))1 n(S) 90

Ques: What is the probability that he dialed a Wrong number. Write answer in comment box Enroll Jagat Chaudhary Follow Qualified IIT-JEE,JIT-JAM. Expert faculty for lIT-JEE Mathematics Courses. M.Sc. Ph.D. (MATHEMATICS) IIT Bhubaneswar.Cofounder at Aspiration