Home
Class 12
MATHS
There are four machines and it is known ...

There are four machines and it is known that exactly two of them are faulty. They are tested, one by one, in a random order till both the faulty machines are identified. Then, the probability that only two tests are needed, is :

A

`(1)/(2)`

B

`(1)/(3)`

C

`(1)/(4)`

D

`(1)/(6)`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Similar Questions

Explore conceptually related problems

There are four machines and it is known that eactly two of them are faulty. They are tested, one by one, in a random order till both the faulty machines are identified. The probability that only two tests are needed is (A) 1/6 (B) 1/3 (C) 1/2 (D) 1/4

If A and B are two independent events, then the probability that only one of A and B occur is

If A and B are two events, the probability that exactly one of them occurs is given by

If M and N are any two events, then the probability that exactly one of them occurs is

Two cards are drawn one by one randomly from a pack of 52 cards. Then find the probability that both of them are king.

Two coins are tossed together. Find the probability of gettig: exactly one tail

Six married couples are locked in a room, If two people are chosen at random, then the probability that one is male and the other is a female is

From a pack of 52 cards, two cards are drawn at random one after the other with replacement. What is the probability that both cards are kings.

Two cards are drawn one by one without replacement. Find the probability that both are hearts.

A lot contains 20 articles. The probability that the lot contains exactly 2 defective articles is 0.4 and the probability thatthe lot contains exactly 3 defective articles is 0.6. Articles are drawn in random one by one without replacement andtested till all the defective articles are found. What is the probability that the testing procedure ends at the twelfth testing ?