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Probability 15 Online
OpenStudy (anonymous):

We connect dots with toothpicks in a grid as shown below. If there are 10 horizontal toothpicks in each row and 20 vertical ones in each column, how many total toothpicks are there?

OpenStudy (anonymous):

21 rows of horizontal 10s and 11 rows of 20 verticals make 21*10+11*20=430

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