4 years ago

Pamela rose her bike at a constant rate of 0.1 kilometer per minute?

Mathematics

1 answer:

Fed [463]4 years ago

3 0

Answer:

Step-by-step explanation:

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Jill bought 3 cookies and 2 cupcakes for $12.25. Kim bought 5 cookies and 1 cupcake for $14.00.

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In a box of 10 calculators, one is defective. In how many ways can four calculators be selected, if you know one

Juliette [100K]

Given:

Total number of calculators in a box = 10

Defective calculators in the box = 1

To find:

The number of ways in which four calculators be selected and one of the four calculator is defective.

Solution:

We have,

Total calculators = 10

Defective calculators = 1

Then, Non-defective calculator = 10-1 = 9

Out of 4 selected calculators 1 should be defective. So, 3 calculators are selected from 9 non-defective calculators and 1 is selected from the defective calculator.

$\text{Total ways}=^9C_3\times ^1C_1$

$\text{Total ways}=\dfrac{9!}{3!(9-3)!}\times 1$

$\text{Total ways}=\dfrac{9\times 8\times 7\times 6!}{3\times 2\times 1\times 6!}$

$\text{Total ways}=\dfrac{9\times 8\times 7}{6}$

$\text{Total ways}=3\times 4\times 7$

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Therefore, the four calculators can be selected in 84 ways.

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3 years ago

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Answer:

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Step-by-step explanation:

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