1. Suppose tickets numbered 0 to 27 are mixed up and kept it in a box. Write down the sample space S for this problem. For a randomly chosen ticket find the probability that 1 or 2 will be modulo 3 residue of S.

A First Course in Probability (10th Edition)
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Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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1. Suppose tickets numbered 0 to 27 are mixed up and kept it in a box. Write down the sample
space S for this problem. For a randomly chosen ticket find the probability that 1 or 2 will
be modulo 3 residue of S.
2. A software company keeps their important files on a CD, on a flash drive and on a Google
drive as a backup copy. Suppose it is known that they keep their 15% files on a CD, 35%
files on a flash drive and 50% files on a Google drive. From the past experience, it is known
that 50%, 30% and 5% files are corrupted when it was backed-up onto the CD, onto the
flash drive, and onto the Google drive, respectively. If a randomly chosen file was found
to be corrupted, what is the probability that the file was not kept on Google drive?
Transcribed Image Text:1. Suppose tickets numbered 0 to 27 are mixed up and kept it in a box. Write down the sample space S for this problem. For a randomly chosen ticket find the probability that 1 or 2 will be modulo 3 residue of S. 2. A software company keeps their important files on a CD, on a flash drive and on a Google drive as a backup copy. Suppose it is known that they keep their 15% files on a CD, 35% files on a flash drive and 50% files on a Google drive. From the past experience, it is known that 50%, 30% and 5% files are corrupted when it was backed-up onto the CD, onto the flash drive, and onto the Google drive, respectively. If a randomly chosen file was found to be corrupted, what is the probability that the file was not kept on Google drive?
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