3 years ago

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

1 answer:

3 0

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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8+7=15
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140 + 160 = 300

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Answer:

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Step-by-step explanation:

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40%

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