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3 years ago

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John an architect, used a scale factor of 1 inch = 20 feet to design a site plan. the actual park has been designed to be 18 fee

t long determine the length of the car park as depicted in the blueprint

1 answer:

lina2011 [118]3 years ago

3 0

Answer:12

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

We need to find the value of ${19}C_1$ .

C stands for combination.

The formula of combination is as follows :

$nC_r=\dfrac{n!}{r!(n-r)!}$

Here,

n = 19 and r = 1

So,

$nC_r=\dfrac{19!}{1!(19-1)!}\\\\nC_r=\dfrac{19!}{1!\times 18!}\\\\nC_r=\dfrac{19\times 18!}{1!\times 18!}\\\\nC_r=19$

So, the value of ${19}C_1$ is 19.

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