To achieve a total of 20, you can use various combinations of numbers. For example, 10 + 10, 15 + 5, or 12 + 8 all sum to 20. Additionally, you could use multiplication, such as 4 x 5. There are numerous other combinations as well, depending on the operations you want to use.
13 and 7
The composite numbers up to 20 are 4,6,8,9,12,14,15,16,18 and 20.
The first 20 odd numbers are: 13579111315171921232527293133353739.
Twenty factorial which is denoted by "20!". 20! = 1x2x3x4x5x6x7x8x...x19x20
This isn't a very specific question ... by four digits, do you mean four numbers? Furthermore, are the digits or numbers you use allowed to repeat? Let's assume you meant numbers, not digits. In this case, for example, you could be trying to create a locker combination, and the numbers you can use are 1 through 20, and the combination has four "blank" spaces. 1. If the numbers can repeat, then each spot has 20 possibilities, so the total number of combinations is 20 for the first spot, 20 for the second, 20 for the third, and 20 for the fourth. That is, 20*20*20*20 = 160,000 combinations. 2. If the numbers cannot repeat, then the first spot can be taken up by any of 20 numbers, the second spot only by 19 (because you can't repeat the first number, whatever it was), the third spot by 18, and the fourth spot by any one of the 17 remaining numbers. So that makes 20*19*18*17 possibilities = 116,280 combinations. If this is not what you meant, and you wanted digits, remember that every number above and including 10 has two digits, so you'll want to factor that into your calculations.
The LCM of 10 and 20 is 20.
13 and 7
The numbers 1-20 are on a dart board so there are twenty numbers.
20 Numbers on a DartBoard.
The composite numbers up to 20 are 4,6,8,9,12,14,15,16,18 and 20.
These are the prime numbers 1-20 2,3,5,7,11,13,17,19
The first 20 odd numbers are: 13579111315171921232527293133353739.
|20| and |-20|
Twenty factorial which is denoted by "20!". 20! = 1x2x3x4x5x6x7x8x...x19x20
20 and 1. 20 + 1 = 21 20 - 1 = 19
1,2,3,4,5,6,10,12,15,20,30,60
20 + 20 + 20 = 60The three identical numbers which add up to 60 are 20