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 Form 4 Exam Standard Mathematics Paper 2 Questions and Answers

A school water reservoir is supplied with water by two pumps P and Q. The probability that pump P fails is
#1/10# and the probability that Q fails is #1/5#.
a).Draw a simple tree diagram to illustrate this information.
b).Calculate the probability that.
i).both pumps are working.
ii).both pumps are not working.
iii).Only one pump is working.
iv).At least one pump is working.

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