Algebra
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Two large and 1 small pumps can fill a swimming pool in 4 hours. One large and 3 small pumps can also fill the same swimming pool in 4 hours. How many hours will it take 4 large and 4 ...
For an inverse to exist it is necessary that a function should be ? Injection Bijection Surjection
At a car park there are 100 vehicles, 60 of which are cars, 30 are vans and the remainder are lorries. If every vehicle is equally likely to leave, find the probability of: a) a van leaving first. b) a ...
What is the probability of a randomly selected CD player will have to be replaced in 8 years or less?