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20 ticket, on which number 1 to 20 are w...

20 ticket, on which number 1 to 20 are written, are mixed throughly and then a ticket is drawn at random out of them. Find the probability that the number on the drawn ticket is a multiple of 3 or 7.

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AGRAWAL PUBLICATION-STATISTICS AND PROBABILITY-EXAMPLE
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  14. If X,M and Z are denoting mean, median and mode of a data and X : M = ...

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  15. Find the mean of the following distributions:

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  16. A child has a die whose 6 faces show the letters given below: The die...

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  17. A child has a die whose 6 faces show the letters given below: The die...

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