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Yanka [14]
3 years ago
9

Find the number of permutations of the first eight letters of the alphabet taking four letters at a time.

Mathematics
1 answer:
polet [3.4K]3 years ago
3 0
The number of permutations of 8 different things taken 4 at a time is given by:
8C4=\frac{8!}{(8-4)!}=8\times7\times6\times5=1680
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A bag has four green marbles, three red marbles, and three yellow marbles. What is the probability that you pick a yellow marble
valina [46]

Step-by-step explanation:

add all marbles together:

4 (green) + 3 (red) + 3 (yellow) = 10 marbles total

if we pick a yellow marble out of the bag and do not replace it, then we have 2 yellow marbles left.

we need to add marbles again with one yellow marble subtracted.

4 (green) + 3 (red) + 2 (yellow) =

new Total is 9 marbles.

so then we have 2 yellow marbles out of 9 total marbles.

2:9

or 2/9

or .22 (22%)

is the probability

6 0
3 years ago
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What is it called when a columns filled with pairs of numbers that have the same ratio?
Furkat [3]
That is a ratio table.
5 0
3 years ago
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Lubov Fominskaja [6]

Answer:

may be 5 I'm not a 100%sure

8 0
3 years ago
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Can someone solve this question
pogonyaev

(g/f)(x)= g(x)/f(x) =


= (x² - 6) /(3x +1)


3x+1≠0

3x≠-1

x≠ - 1/3


(g/f)(x)= (x² - 6) /(3x +1), when x≠ - 1/3


Answer: A.



6 0
3 years ago
Agatha is five times older than her son bob. three years ago she was nine times older. how old is agatha?
Naya [18.7K]
Write an equation system based on the problem
"Agatha is five times older than her son, Bob" could be written as:
  a = 5b.......(first equation)
"Three years ago, she was nine times older" could be written as:
  a - 3 = 9(b - 3)......(second equation)

Solve the equation system
To find the value of b, substitute 5b as a to the second equation
a - 3 = 9(b - 3)
5b - 3 = 9(b - 3)
5b - 3 = 9b - 27
5b - 9b = -27 + 3
-4b = -24
   b = -24/-4
   b = 6
Her son, Bob, is 6 years old

To find Agatha's age, substitute the value of b to the first equation
a = 5b
a = 5 × 6
a = 30
Agatha is 30 years old
4 0
3 years ago
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