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denis-greek [22]
3 years ago
12

What is the probability of rolling a number cube and getting a number greater than four?

Mathematics
1 answer:
solong [7]3 years ago
7 0
The probability would be 8/12
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Use the method of Gauss to find the sum.1+2+3+.....+400
nikklg [1K]
Gauss' method for addition relies on the fact that you can 'pair' certain numbers together. Look at the example:

1+2+3+4+5+6+7+8+9+10

We could manually add all these together from left to right but a clever way to think about this is if we add together the ends of the sum (10+1) we get 11. If we then move one in from the ends and add these (2+9) we also get 11. This means that 1+2+...+9+10 is the same as 11+11+...+11+11.

Because each 2 numbers adds to 11 we know the total number of 11's we have to add together is the length of the sum divided by 2. In our case 5 (10 ÷ 2). We need to add 5 lots of 11 to get our answer. This is the same as 11 × 5 which is easily seen to be 55.

(If you add the 10 numbers together on a calculator you'll see 1+2+3+4+5+6+7+8+9+10 = 55) so this method really makes it a lot quicker.

Looking at your sequence, if we pair the ends together we get 401 (400+1) and we multiply this by the length of the sequence divided by 2. In your case, 200 (400 ÷ 2).

So the sum of all the numbers from 1 to 400 must be 401 × 200 = 80,200.

Remember the steps:
1. Pair the ends together and add them
2. Times this number by the length of the sequence halved

Hope this helps.
6 0
3 years ago
Mary spent $4 more than 1/8 of her original amount of money on a bag. She then
Tanzania [10]

Answer:

464 $

Step-by-step explanation:

8 0
3 years ago
A jet ski rental charges a flat rate of $75, plus an additional $60 per hour. You do not want to spend more than $200. How many
yawa3891 [41]

Answer:

22.5

Step-by-step explanation:

You time 75 by 60. Then, you divided it by 200. The answer is 22.5.

5 0
2 years ago
What is the EXACT and APPROXIMATE volume of the cylinder? (I NEED HELP FAST!)
brilliants [131]
Exact is 320 pi

Approx is  1004.8
8 0
3 years ago
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Wich mathematical expression represent this statement?the sqaure of a number times 3
sergeinik [125]

Answer:

2

Step-by-step explanation:

( n^2)×3 can be written as 3(n^2)

3 0
3 years ago
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