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Integer Answer Type Questions: Probability | JEE Advanced | 35 Years Chapter wise Previous Year Solved Papers for JEE PDF Download

Q.1. Of the three independent events E1, E2 and E3, the probability that only E1 occurs is α, only E2 occurs is β and only E3 occurs is γ. Let the probability p that none of events E1, E2 or E3 occurs satisfy the equations (α 2β)p = αβ and (β – 3γ)p  = 2bg.
 All the given probabilities are assumed to lie in the interval (0, 1). (JEE Adv. 2013)

Integer Answer Type Questions: Probability | JEE Advanced | 35 Years Chapter wise Previous Year Solved Papers for JEE

Ans. Sol. (6) Let P(E1) = x; P(E2) = y, P(E3) = z
P(only E1) = x(1 – y) (1 – z) = α
P(only E2) = (1 – x) y (1 – z) = β
P(only E3) = (1 – x) ( 1 – y) z = g
P(none) = (1 – x) (1 – y) (1 – z) = p.
Now given (α – 2β) p = αβ
⇒ x = 2y an d(β – 3r)p = 2βr ⇒ y = 3z
∴ x = 6z  
Hence

 

Q.2. The minimum number of times a fair coin needs to be tossed, so that the probability of getting at least two heads is at least 0.96, is (JEE Adv. 2015)

Ans. Sol. P(x > 2) > 0.96
1 – P(x = 0) – P(x = 1) > 0.96
⇒ P(x  = 0) + P(x = 1) < 0.04

Integer Answer Type Questions: Probability | JEE Advanced | 35 Years Chapter wise Previous Year Solved Papers for JEE
Integer Answer Type Questions: Probability | JEE Advanced | 35 Years Chapter wise Previous Year Solved Papers for JEE ⇒ Integer Answer Type Questions: Probability | JEE Advanced | 35 Years Chapter wise Previous Year Solved Papers for JEE   

⇒ minimum value of n is 8.

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