katrinny katrinny

24-03-2020
Mathematics

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A sample of 4 is selected from a lot of 20 piston rings. How many different sample combinations are possible?

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cassidybrantley cassidybrantley

24-03-2020

Answer:

Step-by-step explanation:

Sample of 4 is selected: _ _ _ _

Number of possibilities for first selection: 20

Number of possibilities for second selection: 19 (because one was already chosen)

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