Combinatorics - math problems

Number of problems found: 366

  • Combinatorics
    fontains The city has 7 fountains. Works only 6. How many options are there that can squirt ?
  • Variation equation
    fun2_4 Solve combinatorics equation: V(2, x+8)=72 . .. variations second class from x+8 items
  • Calculation of CN
    color_combinations Calculate: ?
  • Trinity
    trojka How many different triads can be selected from group 38 students?
  • Seven
    post_1 Seven friends agree to send everyone a holiday card. How many postcards were sent?
  • Medals
    medails In how many ways can be divided gold, silver, and bronze medal among 21 contestants?
  • Pins 2
    pin_keyboard how many different possible 4 digits pins can be found on the 10-digit keypad?
  • PIN - codes
    pin How many five-digit PIN - code can we create using the even numbers?
  • Hockey
    hokej The hockey match ended 8:2. How many different matches could be?
  • Examination
    examination The class is 21 students. How many ways can choose two to examination?
  • Teams
    football_team How many ways can divide 16 players into two teams of 8 member?
  • Task of the year
    years Determine the number of integers from 1 to 106 with ending four digits 2015.
  • A pizza
    pizza_11 A pizza place offers 14 different toppings. How many different three topping pizzas can you order?
  • How many 2
    chart_2 How many three lettered words can be formed from letters A B C D E G H if repeats are: a) not allowed b) allowed
  • N-gon
    ngon How many diagonals has convex 11-gon?
  • Possible combinations - word
    dices2 How many ways can the letters F, A, I, R be arranged?
  • Diagonals
    diagonals_1 What x-gon has 54 diagonals?
  • First man
    workers_7 What is the likelihood of a random event where are five men and seven women first will leave the man?
  • Combinations
    math_2 From how many elements we can create 990 combinations 2nd class without repeating?
  • Committees
    globe How many different committees of 2 people can be formed from a class of 21 students?

Do you have an interesting mathematical word problem that you can't solve it? Submit a math problem, and we can try to solve it.



We will send a solution to your e-mail address. Solved examples are also published here. Please enter the e-mail correctly and check whether you don't have a full mailbox.

Please do not submit problems from current active competitions such as Mathematical Olympiad, correspondence seminars etc...



Would you like to compute count of combinations?