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Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - JEE MCQ


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8 Questions MCQ Test Daily Test for JEE Preparation - Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan)

Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) for JEE 2025 is part of Daily Test for JEE Preparation preparation. The Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) questions and answers have been prepared according to the JEE exam syllabus.The Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) MCQs are made for JEE 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) below.
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Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 1

From past experience it is known that an investor will invest in security A with a probability of , will invest in security B with a probability and will invest in both and with a probability of . What is the probability that an investor will invest neither in A nor in B?

Detailed Solution for Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 1
As given and



So, neither in nor in
Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 2

If A, B, C are events such that P(A) = 0.3,P(B) = 0.4, P(C) = 0.8, P(A∩B) = 0.08, P(A∩C) = 0.28 P(A∩B∩C) = 0.09 If P(A ∪ B ∪ C) ≥ 0.75, then find the range of x = P(B∩C) lies in the interval

Detailed Solution for Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 2

Since
Or

Or
But we know that
Hence

Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 3

A machine has three parts, and , whose chances of being defective are and respectively. The machine stops working if any one of the parts becomes defective. What is the probability that the machine will not stop working?

Detailed Solution for Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 3

Probability that machine stops working






are independent events



∴ Probability that the machine will not stop working

Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 4

The probability that at least one of the events A and B occurs is 0.6. If A and B occur simultaneously with probability 0.2, then the value of   is: (where are complements of and respectively)

Detailed Solution for Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 4

Here, given that and

Using addition rule of probability

Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 5

An aircraft has three engines and . The aircraft crashes if all the three engines fail. The probabilities of failure are and for engines and respectively. What is the probability that the aircraft will not crash?

Detailed Solution for Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 5

Since, probabilities of failure for engines A, B and CP(A),P(B) and P(C) are 0.03,0.02 and 0.05 respectively. The aircraft will crash only when all the three engine fail. So, probability that it crashes =P(A)⋅P(B)⋅P(C)


Hence, the probability that the aircraft will not crash

Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 6

Let A and B be two events. Then 1+P(A∩B)−P(B)−P(A) is equal to

Detailed Solution for Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 6

We know
Consider;

Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 7

Given two mutually exclusive events A and B such that P(A) = 0.45 and P(B) = 0.35, P(A∩B) is equal to

Detailed Solution for Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 7

P(A) = 0.45,
P(B) = 0.35 (events are mutually exclusive)

Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 8

If and are independent events of a random experiment such that and , then is equal to (Here, is the complement of the event )

Detailed Solution for Probability: Probability of an Event, Addition and Multiplication Theorem(13 Jan) - Question 8

Given that, 


Hence, options (2) and (3) are correct.

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