Combinatorics - math word problems
The lottery is 60000 elk in which 6200 wins. What is the probability that the purchase of 12 elks won nothing?
- School trip
The class has 19 students. What different ways students can be accommodated in the hostel, where available 3× 2-bed, 3× 3-bed and 1× 4-bed rooms. (Each room has its unique number)
How many times must throw the dice, the probability of throwing at least one six was greater than 90%?
At the party everyone clink with everyone. Together, they clink 406 times. How many people were at the party?
- Phone numbers
How many 7-digit telephone numbers can be compiled from the digits 0,1,2,..,8,9 that no digit is repeated?
What is the probability that a family with 7 childrens have: exactly 5 girls? 7 girls and 0 boys? Consider the birth probability of a girl is 48.69% and boy 51.31%.
Would you like to compute count of combinations?