You roll a fair die repeatedly. Find the probability that: a) the first “6” occurs on your 10th roll b) the first “6” occurs after the 10th roll c) the third “6” occurs on the 20th roll

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
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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You roll a fair die repeatedly. Find the probability that:

a) the first “6” occurs on your 10th roll
b) the first “6” occurs after the 10th roll
c) the third “6” occurs on the 20th roll
d) the third “6” occurs after the 20th roll

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Given:

A die is rolled.

Number of faces = 6

P (6)=p  = 16

Let X be the number of rolls required for the first 6.

X~Geom16

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