brae72
09.06.2020 •
Mathematics
Out of 100 people who attended a concert (pre-Corona obviously), 26 bought a teeshirt and 42 sat in the lawn section. Six students who sat in the lawn section also bought tee shirts. If a person who attended the concert was randomly selected, what is the probability that they bought a teeshirt if it is known that they did not sit in the lawn section? The first term in a geometric series is 5 and the common ratio is 2. Find the sum of the first 10 terms in the series.
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Ответ:
Explanation:
There are 5 letters, so there would be 5! = 5*4*3*2*1 = 120 different permutations; however, there are 2 letter 'o's meaning we have double counted. To correct this, divide by 2 to get 120/2 = 60.
If there was a way to tell the two 'o's apart, then the answer would be 120.