Combinatorics - practice for 12 year olds - page 2 of 6
Number of problems found: 105
- Seagull
An artificially created island in the shape of a circle with a radius of 50 m is overgrown with grass. The only exception is a landing area for helicopters in the shape of a rectangle measuring 15 m and 8 m. What is the probability that the flying seagull - Options 3572
We roll three dice. Write down all the feast options. - Roll the dice
What is the probability that if we roll the dice, a number less than five falls? - Three digits number 2
Find the number of all three-digit positive integers that can be put together from digits 1,2,3,4 and which are subject to the same time has the following conditions: on one position is one of the numbers 1,3,4, on the place of hundreds 4 or 2.
- Different 6709
Milan found out that he could wear pants and a T-shirt in a total of 28 different ways. How many T-shirts and pants can he have? List all options. - How many 4
How many four-digit numbers that are divisible by ten can be created from the numbers 3, 5, 7, 8, 9, and 0 such no digits repeats? - Probability 65464
We randomly draw one out of 18 cards with numbers from 1 to 18. What is the probability that the ticket drawn is a prime number? Write the result as a decimal number rounded to two decimal places. - Scrap
From 19 products are 4 scraps. What is the probability that the random pick of 2 products has no defective product? - Probability 41101
What is the probability of a random event A that a) an even number, b) a number divisible by three, c) a number greater than six will fall on the dice roll.
- Entertainment 41081
In the entertainment lottery, they draw one number from 1 to 35. What is the probability that they will draw an odd compound number? - The dice
Find the probability that a number divisible by two or three will fall when the dice are rolled. - Raffle
In the pool number from 1 to 115. What is the probability that a randomly selected number is not a prime number? - Two-digit 26211
Writes all two-digit numbers using the numbers 4 and 7 - Flags
How many different flags can be made from green, white, blue, red, orange, yellow, and purple materials, so each flag consists of three different colors?
- Five-digit
Find all five-digit numbers that can be created from number 12345 so that the numbers are not repeated and then numbers with repeated digits. Give the calculation. - Attempts 3460
How many attempts do I need to guess the 3-digit PIN to be sure I can guess it? - Coin and die
Flip a coin and then roll a six-sided die. How many possible combinations are there? - Bulbs
In the box are 6 bulbs with power 75 W, 14 bulbs with power 40 W, and 15 with 60 W. Calculate the probability that a randomly selected bulb is: - Repetition 8329
How many 5-digit numbers without repetition have the last digit two smaller than the previous one?
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