In a jar there are 15 white balls, 25 red balls, 10 blue balls and 20 green balls. How many balls must be taken out in order to make sure we took out 8 of the same color?
In a jar there are 15 white balls, 25 red balls, 10 blue balls and 20 green balls. How many balls must be taken out in order to make sure we took out 8 of the same color?
How many diagonals does a polygon with 18 sides have if three of its vertices do not send any diagonal?
How many diagonals does a polygon with 18 sides have if three of its vertices do not send any diagonal?
A drawer holds 4 red hats and 4 blue hats. What is the probability of getting exactly three red hats or exactly three blue hats when taking out 4 hats randomly out of the drawer and returning each hat before taking out the next one?
A drawer holds 4 red hats and 4 blue hats. What is the probability of getting exactly three red hats or exactly three blue hats when taking out 4 hats randomly out of the drawer and returning each hat before taking out the next one?
In a department store prize box, 40% of the notes give the winner a dreamy vacation; the other notes are blank. What is the approximate probability that 3 out of 5 people that draw the notes one after the other, and immediately return their note into the box get a dreamy vacation?
In a department store prize box, 40% of the notes give the winner a dreamy vacation; the other notes are blank. What is the approximate probability that 3 out of 5 people that draw the notes one after the other, and immediately return their note into the box get a dreamy vacation?
In how many ways can you sit 8 people on a bench if 3 of them must sit together?
In how many ways can you sit 8 people on a bench if 3 of them must sit together?
How many 8-letter words can be created using computer language (0/1 only)?
How many 8-letter words can be created using computer language (0/1 only)?
How many five-digit numbers are there, if the two leftmost digits are even, the other digits are odd and the digit 4 cannot appear more than once in the number?
How many five-digit numbers are there, if the two leftmost digits are even, the other digits are odd and the digit 4 cannot appear more than once in the number?
What is the probability of getting a sum of 8 or 14 when rolling 3 dice simultaneously?
What is the probability of getting a sum of 8 or 14 when rolling 3 dice simultaneously?
In Rwanda, the chance for rain on any given day is 50%. What is the probability that it rains on 4 out of 7 consecutive days in Rwanda?
In Rwanda, the chance for rain on any given day is 50%. What is the probability that it rains on 4 out of 7 consecutive days in Rwanda?
In how many ways can you sit 7 people on a bench if Suzan won’t sit on the middle seat or on either end?
In how many ways can you sit 7 people on a bench if Suzan won’t sit on the middle seat or on either end?
What is the probability of getting a sum of 12 when rolling 3 dice simultaneously?
What is the probability of getting a sum of 12 when rolling 3 dice simultaneously?
How many diagonals does a polygon with 21 sides have, if one of its vertices does not connect to any diagonal?
How many diagonals does a polygon with 21 sides have, if one of its vertices does not connect to any diagonal?
What is the probability for a family with three children to have a boy and two girls (assuming the probability of having a boy or a girl is equal)?
What is the probability for a family with three children to have a boy and two girls (assuming the probability of having a boy or a girl is equal)?
Ruth wants to choose 4 books to take with her on a camping trip. If Ruth has a total of 11 books to choose from, how many different book quartets are possible?
Ruth wants to choose 4 books to take with her on a camping trip. If Ruth has a total of 11 books to choose from, how many different book quartets are possible?
How many four-digit numbers that do not contain the digits 3 or 6 are there?
How many four-digit numbers that do not contain the digits 3 or 6 are there?
How many 5 digit numbers can be created if the following terms apply: the leftmost digit is even, the second is odd, the third is a non even prime and the fourth and fifth are two random digits not used before in the number?
How many 5 digit numbers can be created if the following terms apply: the leftmost digit is even, the second is odd, the third is a non even prime and the fourth and fifth are two random digits not used before in the number?
A computer game has five difficulty levels. In each level you can choose among four different scenarios except for the first level, where you can choose among three scenarios only. How many different games are possible?
A computer game has five difficulty levels. In each level you can choose among four different scenarios except for the first level, where you can choose among three scenarios only. How many different games are possible?
A Four digit safe code does not contain the digits 1 and 4 at all. What is the probability that it has at least one even digit?
A Four digit safe code does not contain the digits 1 and 4 at all. What is the probability that it has at least one even digit?
The telephone company wants to add an area code composed of 2 letters to every phone number. In order to do so, the company chose a special sign language containing 124 different signs. If the company used 122 of the signs fully and two remained unused, how many additional area codes can be created if the company uses all 124 signs?
The telephone company wants to add an area code composed of 2 letters to every phone number. In order to do so, the company chose a special sign language containing 124 different signs. If the company used 122 of the signs fully and two remained unused, how many additional area codes can be created if the company uses all 124 signs?
In a jar there are 21 white balls, 24 green balls and 32 blue balls. How many balls must be taken out in order to make sure we have 23 balls of the same color?
In a jar there are 21 white balls, 24 green balls and 32 blue balls. How many balls must be taken out in order to make sure we have 23 balls of the same color?