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GrogVix [38]
3 years ago
8

What percent of the first 20 natural numbers are prime numbers?

Mathematics
2 answers:
BARSIC [14]3 years ago
6 0

Answer:  The required percentage is 40%.

Step-by-step explanation:  We are given to find the percentage of the first 20 natural numbers that are prime.

We know that

first 20 natural numbers are 1, 2, 3, 4,  .  .  .  , 19, 20.

And, the prime numbers among them are 2, 3, 5, 7, 11, 13, 17 and 19.

So, if S be the sample space for the experiment and A be the event of selecting a prime number.

Then, we have

n(S) = 20  and  n(A) = 8.

Therefore, the probability of event A is given by

P(A)=\dfrac{n(A)}{n(S)}=\dfrac{8}{20}=\dfrac{2}{5}\times100\%=40\%.

Thus, the required percentage is 40%.  

Brilliant_brown [7]3 years ago
3 0
The primes are 2, 3, 5, 7, 11, 13, 17, 19. There are 8 of them, so they make up 40% of the numbers 1–20.
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hours did it take for oil to cover the area  = 592

The correct option is B.

<h3>What is geometrical figure?</h3>

Geometrical shapes are the shapes that depict the shapes of various items. Various figures have two dimensions, while others have three. Only the x and y axes are used for two-dimensional figures, whereas the x, y, and z axes are used for three-dimensional shapes.

<h3>According to the given information:</h3>

Given,

Area = 11000m²

Radius = .10m/h

We know the area of the circle:

Area = πr²

The relation between parameter:

Area = πr²

11000 = 3.14 * (0.10t)²

Dividing both side by 3.14

11000/3.14 = (3.14 * (0.10t)²)/3.14

by solving this we get:

(.10t)² = 3503.184

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dividing both side by 0.10

t  = 59.187/.10

t =  591.877

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4 0
1 year ago
Is 3y^2-2y already simplified
geniusboy [140]
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The Jackson family is putting down flooring in part of their basement. The floor in this part of the basement measures 10 feet w
bixtya [17]

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Which two points satisfy y = -x2 2x 4 and x y = 4?
matrenka [14]
I will assume that the two equations are

1) y = -x^2 +2x + 4 and 2) x +y = 4

subtract 2 from 1 and you get

y -x - y = -x^2 + 2x + 4 - 4

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Solutions:

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6 0
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