Combinatorics - math word problems
Number of problems found: 405
From statistics of sales goods, item A buy 51% of people and item B buys 59% of people. What is the probability that from 10 people buy 2 item A and 8 item B?
Event P has probability of 0.84. What is the probability that the event P occurs in 3, 5, 7 try.
Pediatrician this month of 20 working days takes 8 days holidays. What is the probability that on Monday it will be at work?
- TV fail
The TV has after 10,000 hours average 35 failures. Determine the probability of TV failure after 400 hours of operation.
In how many points will intersect 14 different lines, where no two are parallel?
- 7 heroes
9 heroes galloping on 9 horses behind. How many ways can sort them behind?
- Bureau of Labor
Bureau of Labor is a state institution that provides mike and the rest for their so-called clients. The mission of the Bureau of Labor is spend taxpayer money to provide relaxation and benefits to those who do not want to work. Popularly speaking sense th
In a rectangle with sides, 8 and 9 mark the diagonal. What is the probability that a randomly selected point within the rectangle is closer to the diagonal than to any side of the rectangle?
In the pool is numbers from 1 to 115. What is the probability that a randomly selected number is not a prime number?
The hockey match ended 8:2. How many different matches could be?
- Calculation of CN
Calculate: (789 choose 786) - (789 choose 3)
How many are all subsets of set C = (97, 67, 66, 18, 59, 64)?
What is the probability that a random word composed of chars E, Y, G, E, R, O, M, T will be the GEOMETRY?
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:
How many rectangles with area 8713 cm2 whose sides are natural numbers are?
How many different flags can be made from colors red, yellow, blue, green, white to consist of three different colors?
The probability that a good shooter hits the center of the target circle I is 0.1. The probability that the target hit intercircle is II 0.58. What is the probability that it hits the target circle I or II?
In army regiment are six shooters. The first shooter target hit with a probability of 49%, next with 75%, 41%, 20%, 34%, 63%. Calculate the probability of target hit when shooting all at once.
- Event probability
The probability of event P in 8 independent experiments is 0.33. What is the probability that the event P occurs in one experiment (chance is the same)?
The probability that the bulb can operate 4000 hours is 0.3. What is the probability that exactly one of eight bulbs can operate 4000 hours?
Would you like to compute count of combinations?