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s2008m [1.1K]
3 years ago
10

Count the possible combinations of r letters chosen from the given list P.Q,R,S,T,U; r = 2

Mathematics
1 answer:
Tasya [4]3 years ago
4 0

Answer:

<h2>There are 30 possible combinations of picking two letters.</h2>

Step-by-step explanation:

The combinations are defined as

C^{r}_{n}=\frac{n!}{(n-r)!}

Where n is the total number of elements and r is the number of letter we are gonna picke, which is two. Using this information, we have

C^{2}_{6}=\frac{6!}{(6-2)!}=\frac{6!}{4!}=\frac{6 \times 5 \times 4!}{4!}=30

Therefore, there are 30 possible combinations of picking two letters.

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What does ! mean in a math problem?
SIZIF [17.4K]
Answer:
! is the symbol for factorial.

Reason:
n! is the product (multiplication) of all the numbers from n down to 1, inclusive, i.e. n × (n−1) × (n−2) × … × 2 × 1.

For example:

5! = 5 × 4 × 3 × 2 × 1 = 120

10! = 10 × 9 × 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 3,628,800

OR:
The there was a typo or a mistake that was made in the making of these questions.


Give this answer Brainliest!

7 0
2 years ago
Read 2 more answers
How many different 7-digit number plates can be made if the first 2 digits are letters and the last 5 digits are numbers, for ex
saw5 [17]

Answer:

We can use seven letters and numbers.

I am assuming that any numeral in the range 0..9 or any letter from the English alphabet A..Z can appear in any position, with no blank spaces allowed and no restrictions on repetition. I am also assuming that plates with fewer than seven letters and numbers are not allowed.

So, for example A879BX8 is acceptable, so are 5555555 and ABCDEFG, but not A.123.ZX or…..7A, where the dot represents a space.

I am also assuming that you can only use upper case letters.

With these restrictions, there are 36 possibilities for each space and the total number of valid number plates would be 36^7 = 78,364,164,096, let's say about 78 billion.

It is estimated that there are about 1.3 billion cars, trucks and buses in the road today. This number plate system therefore allows more than enough unique license plates. I'd even hazard a guess that it might be more than enough for every road vehicle that has ever been built or ever will be.

In practice there would be other restrictions, for example only letters in some positions and only numbers in others. There'd still be plenty to go around.

Step-by-step explanation:

5 0
3 years ago
  Express 35.4% as a decimal.
lakkis [162]
It is because the 35.4% divided the 100% total is B. 0.354
8 0
3 years ago
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the scale of a stone memorial to its scale model is 1meter : 12cm. if the memorial is in the shape of a cube with a volume of 1
yawa3891 [41]
1 meter :12 cm
1 cubic meter = 1 x 1 x 1 : 12 x 12 x 12 = 1,728 cubic cm.
8 0
3 years ago
Simplify rational equations <br><br><br><br> y=x^2+3x/x<br><br>Show work, please
lora16 [44]

Answer:

6

Step-by-step explanation:

2y x 3x

7 0
4 years ago
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