any 4 from 7 is 35, in any order is 35 x 24 ie 840
4!=4x3x2x1=24
There is 1 combination of all ten numbers, 10 combinations of one number and of nine numbers, 45 combinations of two or eight numbers, 120 combinations of three or seven numbers, 210 combinations of four or six numbers and 252 combinations of five numbers. That is 1023 = 210 - 1 in total.
The four numbers that can be used in combinations or differences to make all numbers from 1 to 30 are 1, 2, 4, and 8. These numbers are powers of 2, which allows for the creation of all numbers from 1 to 30 through various combinations and differences. By using these four numbers strategically, one can generate any integer between 1 and 30.
There are 360 of them.
To get the numbers 1-100 using four nines in the Four Nines Contest, you can employ various mathematical operations such as addition, subtraction, multiplication, division, square roots, and factorials. For example, you can create the number 1 by using the expression ((9 + 9 - 9) / 9). Similarly, for other numbers, combinations of these operations can be creatively applied, like using (9 + 9 + \frac{9}{9}) to get 19. The challenge lies in finding unique combinations for each number from 1 to 100.
45
7
126 combinations. Remember that the order does not matter.
11
Seven million four thousand in numbers is written as 7,004,000.
If each number can be used only once then there are just four: 2345, 2346, 2456 and 3456. There are no others because the order of the digits does not matter in combinations.
shut up guys