Combinatorial number + reason - practice problems - page 4 of 6
Number of problems found: 112
- Three numbers
We have three different non-zero digits. We will create all three digits numbers from them to use all three figures in each. We add all the made numbers and get the sum of 1554. What were the numbers? - Different 7860
How many different triplets can be created from 4 pupils if it does not matter the order of the pupils in the triplets? - Numbers 7755
How many digits 7 are in numbers from 1 to 777? - Each with each
Five pupils from 3A class played table tennis. How many matches did they play with each other?
- Probability 7628
The probability that six will fall in just three rolls is once? - Competition 7328
Adam was practicing for a darts competition in class. Every day at home, he threw darts at a target in which the individual fields were worth 1,3 and 5 points. He threw 9 darts every day and always scored 27 points. He is in good form and never missed a t - Five-digit numbers
How many different five-digit numbers can be created from the number 2,3,5 if the number 2 appears in the number twice and the number 5 also twice? - Peaches
There are 20 peaches in the pocket. Three peaches are rotten. What is the probability that one of the randomly picked two peaches will be just one rotten? - Sweater
Dana confuses me that sweaters and wool have a choice of seven colors. In how many ways can she choose from three colors for the sleeves?
- Triangles
Five sticks with a length of 2,3,4,5,6 cm. How many ways can you choose three sticks to form three sides of a triangle? - Accommodated 6614
Sixteen students on the brigade will be accommodated in one 8-bed and two 4-bed rooms. How many ways can they do that? - Three students
Three students independently try to solve the problem. The first student will solve a similar problem with a probability of 0.6, the second student will solve at a probability of 0.55, and the third will solve at a probability of 0.04. The problem is reso - Bridge cards
How many bridge hands are possible containing 4 spades, 6 diamonds, 1 club, and 2 hearts? - Dice
We throw five times the dice. What is the probability that six fits precisely twice?
- Subsets
How many 19 element subsets can be made from the 26 element set? - Test
The teacher prepared a test with ten questions. The student can choose one correct answer from the four (A, B, C, D). The student did not get a written exam at all. What is the probability that: a) He answers half correctly. b) He answers all correctly. c - Sum on dice
We have two dice. What is the greater likelihood of falling a total sum of 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 of seven or product 12? - Lines
How many lines can be drawn with 8 points if three points lie on one line and the other any three points do not lie on the same line?
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See also our combinations calculator. Combinatorial number - practice problems. Reason - practice problems.