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R live on 6th floor. T lives immediately below R. Only two persons live between R and U. V live above U but not at the topmost floor. W cannot sit on topmost floor because no two persons according to alphabetical order live adjacent to each other
If the letters of the word HORIZON be arranged at random, what is the probability that all the vowels are together?
A student is required to select 4 questions to attempt from a set of 10 questions. How many different ways can the student make this selection?
A bag contains 3 black and 9 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?
A bag contains 3 white balls , 5 blue balls , and 8 red balls . One ball is picked randomly from the bag and discarded. What is the probabil...
Two schools, A and B participate in a Quiz competition. The probability of A’s winning is 3/7 and the probability of B’s winning is 3/5. Wha...
A bag contains 20 white and some black balls. If the probability of drawing a black ball from the bag is 6.25 times that of drawing a white ball,...
A bowl contains 9 blue balls, 7 white, and 5 black balls. If 2 balls are drawn in one go, then the probability of exactly one ball being white is:
A box contains 6 Brown and 8 Blue caps. There is another box which contains 8 Brown and 7 Blue caps. One cap is to drawn from either of the two boxes. ...
A bag contains 12 white and some black balls. If the probability of drawing a black ball from the bag is thrice that of drawing a white ball, fin...