the answer is E
Aptitude
Topic: Probability
There are 10 lamps in a hall.Each one of them can be switched independently.Then How many number of ways in which the hall can be illuminated?A.2^(10) -1B.2^(10)C.2D.2^(10) -2E.None of these
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In a hotel, rooms are numbered from 101 to 550. A room is chosen at random. What is the probability that room number starts with 1, 2 or 3 and ends with 4, 5 or 6?
There are 3 ants at 3 corners of a triangle, they randomly start moving towards another corner.What is the probability that they don't collide?
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IN HOW MANY WAYS CAN THE LETTERS OF THE WORD PREUNIVERSITY BE ARRANGED.a.6227020800b.778377600c.1556755200d.3113510400
There are 10 lamps in a hall.Each one of them can be switched independently.Then How many number of ways in which the hall can be illuminated?A.2^(10) -1B.2^(10)C.2D.2^(10) -2E.None of these
When two dice are thrown simultaneously, what is the probability that the sum of the two numbers is less than 11?A. 5/6 B. 11/12 C. 1/6 D. 1/12 E. 2/3
The probability that John speaks truth is 3/4 and the probability for Cheryl speaking truth is 4/5. What is the probability that they contradict each other when asked to speak on certain fact ?A) 3/20 B) 2/5 C) 7/20 D) 1/5 E) 3/5
A bag has 10 black balls and 10 White balls. Person A picks two balls at random, than Person B picks two of the remaining balls at random. What is the probability of them getting the same color combination.A. 118 / 323 B. 121 / 323 C. 81 / 323 D. 205 / 323 E. 181 / 323
A die is rolled and a coin is tossed, find the probability that the die shows an odd number and the coin shows a head.
A card is drawn at random from a deck of cards. Find the probability of getting a queen.
