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03.08.2019 •
Mathematics
There are six entrances to a haunted house. if you do not exit the same way you entered, how many different ways can you enter and exit the house? a.) 20b.) 25c.) 30d.) 36
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Ответ:
Choice C) 30
Note: you can use the nPr formula with n = 6 and r = 2 to get the same answer
Alternatively, you can use a probability tree to map out all the possibilities though such a tree with 30 branches may take a while to draw out
Ответ:
Explanation: These numbers are in absolute value. Therefore, the absolute value of -8 is actually 8, which makes it greater than the absolute value of 7 in this equation.