# Raffle

In the pool is numbers from 1 to 115. What is the probability that a randomly selected number is not a prime number?

Result

p =  73.9 %

#### Solution:

Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):

Be the first to comment!

#### To solve this example are needed these knowledge from mathematics:

Would you like to compute count of combinations?

## Next similar examples:

1. MO 2016 Numerical axis
Cat's school use a special numerical axis. The distance between the numbers 1 and 2 is 1 cm, the distance between the numbers 2 and 3 is 3 cm, between the numbers 3 and 4 is 5 cm and so on, the distance between the next pair of natural numbers is always in
2. The percentages in practice
If every tenth apple on the tree is rotten it can be expressed by percentages: 10% of the apples on the tree is rotten. Tell percent using the following information: a. in June rained 6 days b, increase worker pay 500 euros to 50 euros c, grabbed 21 fro
3. TVs
Production of television sets increased from 3,500 units to 4,200 units. Calculate the percentage of production increase.
4. Simplify 2
Simplify expression: 5ab-7+3ba-9
5. Number
What number is 20 % smaller than the number 198?
6. Bulbs
In the box are 6 bulbs with power 75 W, 14 bulbs with power 40 W and 15 with 60 W. Calculate probability that a randomly selected bulb is:
7. Class
In a class are 32 pupils. Of these are 8 boys. What percentage of girls are in the class?
8. New refrigerator
New refrigerator sells for 1024 USD, Monday will be 25% discount. How much USD will save, and what will be the price?
9. Gloves
I have a box with two hundred pieces of gloves in total, split into ten parcels of twenty pieces, and I sell three parcels. What percent of the total amount I sold?
10. Unknown number
Identify unknown number which 1/5 is 40 greater than one tenth of that number.
11. Equation
Solve the equation: 1/2-2/8 = 1/10; Write the result as a decimal number.
12. Conference
148 is the total number of employees. The conference was attended by 22 employees. How much is it in percent?
13. Base, percents, value
Base is 344084 which is 100 %. How many percent is 384177?
14. Inequation
Solve the inequation: 5k - (7k - 1)≤ 2/5 . (5-k)-2
15. Apples 2
James has 13 apples. He has 30 percent more apples than Sam. How many apples has Sam?
16. Percents - easy
How many percent is 432 out of 434?
17. Sales off
Goods is worth € 70 and the price of goods fell two weeks in a row by 10%. How many % decreased overall?