Variations + reason - math problems

Number of problems found: 56

  • Chocolates
    How many ways can we distribute 8 different chocolates to four children?
  • Five-digit numbers
    How many different five-digit numbers can be created from the numbers 2,3,5 if the number 2 appears in the number twice and the number 5 also twice?
  • Inverted nine
    In the hotel Inverted Nine, each hotel room number is divisible by 6. How many rooms can we count with the three-digit number registered by digits 1,8,7,4,9?
  • PIN code
    PIN on Michael credit card is a four-digit number. Michael told this to his friend: • It is a prime number - that is, a number greater than 1, which is only divisible by number one and by itself. • The first digit is larger than the second. • The second d
  • To improve
    To improve her handwriting Paula practices writing the numbers 1 to 200 in words. How many times will she have written the word "one" in all?
  • Sweater
    Dana confuses sweater and wool has a choice of seven colors. In how many ways can she choose from three colors to the sleeves?
  • Lunch
    Seven classmates go every day for lunch. If they always come to the front in a different order, will be enough school year to take of all the possibilities?
  • Seven
    Seven friends agree to send everyone a holiday card. How many postcards were sent?
  • Twins with friend
    The twins Danka and Janka went to the cinema with their friend Betka. Only six seats in the second row were available in the cinema. The twins want to sit next to each other, and Danka always to the right of Janka and Betka near one of them. How many do t
  • Desks
    A class has 20 students. The classroom consists of 20 desks, with 4 desks in each of 5 different rows. Amy, Bob, Chloe, and David are all friends, and would like to sit in the same row. How many possible seating arrangements are there such that Amy, Bob,
  • Word MATEMATIKA
    How many words can be created from the phrase MATEMATIKA by changing the letters' order, regardless of whether the words are meaningful?
  • Six on dice
    What is the probability that when throwing two dice will fall at least one six?
  • Sum on dice
    We have two dice. What is the greater likelihood of fall a total sum 7 or 8 ? (write 7, 8 or 0 if the probabilities are the same)?
  • Sum or product
    What is the probability that two dice fall will have the sum 7 or product 12?
  • Lines
    How many lines can be draw with 8 points, if three points lie on one line and the other any three points do not lie on the same line?
  • Digits
    How many five-digit numbers can be written from numbers 0.3,4, 5, 7 that is divided by 10, and if digits can be repeated?
  • Three reds
    What is the probability that when choosing 3 carats from seven carats, all 3 reds will be red?
  • Tricolors
    From the colors - red, blue, green, black, and white, create all possible tricolors.
  • Digits
    How many natural numbers greater than 4000 which are formed from the numbers 0,1,3,7,9 with the figures not repeated, B) How many will the number of natural numbers less than 4000 and the numbers can be repeated?
  • Alarm clock
    The old watchmaker has a unique digital alarm in its collection that rings whenever the sum of digits of the alarm is equal to 21. Find out when the alarm clock will ring. What is their number? List all options . ..

Do you have an exciting math question or word problem that you can't solve? Ask a question or post 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.



See also our variations calculator. Variations - math problems. Reason - math problems.