Reason + combinatorial number - practice problems
Number of problems found: 110
- Hockey
The hockey match ended 7:4. How many different matches could be? - Two-element combinations
Write all two-element combinations from elements a, b, c, and d. - Probability 7628
The probability that six will fall in just three rolls is once? - Dice
We throw five times the dice. What is the probability that six fits precisely twice? - Designated 64234
Marenka is required to read three books out of five designated books. How many ways can three books choose to be read? - Fruits
The shop sells four kinds of fruits. How many ways can we buy three pieces of fruit? - Probability 73054
We roll six dice. What is the probability that: a) a six falls twice b) six falls four times - Chocolates
In the market, we have 3 kinds of chocolates. How many ways can we buy 8 chocolates? - Probability 17503
We choose four numbers from numbers 1 - 20. What probability will the numbers 6 or 10 be among them? - Subsets
How many 19 element subsets can be made from the 26 element set? - Determined 16233
How many lines are determined by 5 points if three lie in one line? - Numbers 7755
How many digits 7 are in numbers from 1 to 777? - Lines
How many points will intersect 14 different lines where no two are parallel? - Circles
How many different circles are determined by 11 points at the plane if 7 of them lie in a straight line? - Determined 3570
There are 12 points in space, with no three lying on a straight line. How many different planes are determined by these points? - Two aces
From a 32-card box, we randomly pick 1 card and then two more cards. What is the probability that the last two drawn cards are aces? - Questions 81676
You will learn 50% of the 30 questions. If I get 4 questions, I'll know 3. - Probability 81115
The probability of sprouting each avocado pit is 0.9. We planted 3 stones. What is the probability that exactly two of them will sprout? - Ten persons
Ten persons, each person, make a hand to each person. How many hands were given? - Pairs of socks
Ferdinand has twelve pairs of socks, and one sock is leaky. What is the probability of putting on a leaky sock?
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