Probability
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Mr. X invites 15 relatives to a party: his mother, three uncles, two aunts, four brothers, and five cousins. If the chances of any one guest arriving first are equally likely, find the following probabilities:
a. the first guest is an uncle or a cousin
b. the first guest is a brother or a cousin
c. the first guest is an uncle or her mother
https://brainmass.com/math/probability/calculating-probability-situation-4306
SOLUTION This solution is FREE courtesy of BrainMass!
Total No# of Relatives = 15
a) No of Uncles = 3
No of Cousins = 5
Probability = Number of success events / Total Number of events
= (3+5)/15
= 8/15
b) No of Brothers = 4
No of cousins = 5
Probability = 9/15 ( same logic as above)
c) No of Uncles = 3
Probability = (3+1)/15 ( +1 FOR MOTHER)
= 4/15.
Hope it is clear.
Once again: Probability = No of success events/ Total No of events
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