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The stethoscope was invented by René Laennec in France in 1816. It is a critical tool in medicine for auscultating or listening to the internal sounds of the body, particularly the heart and lungs.
A bag contains black and white balls, such that the probability of picking a black ball is 4/7. If the probability of picking two black balls without re...
Two cards are drawn together from a pack of 52 cards. The probability that one is a club and one is a diamond?
In a group of artists, there are 10 dancers and 8 singers. If four artists are to be selected at random, what is the probability that 2 dancers and 2 si...
A box contains only three colors of balls- red, green and blue. What is the minimum number of balls that should be picked from the box to ensure that at...
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, find the n...
A bag contains 35 white and some black balls. If the probability of drawing a black ball from the bag is 1.8 times that of drawing a white ball, find th...
Out of 8 white marbles, 5 blue marbles, in how many ways we select one or more marbles?
The probability of selecting a rotten apple randomly from a heap of 100 apples is 0.20. What is the number of rotten apples in the heap?
...A bag contains 5 red books, 7 yellowbooks and 7 greenbooks . 3books are drawn randomly. What is the probability that the
21 rotten bananas are accidentally mixed with 135 good ones. It is not possible to just look at a banana and tell whether or not it is rotten. One banan...