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The correct answer is 10*9/2 = 45. The 45 are:
01, 02, 03, 04, 05, 06, 07, 08, 09
12, 13, 14, 15, 16, 17, 18, 19,
23, 24, 25, 26, 27, 28, 29,
34, 35, 36, 37, 38, 39,
45, 46, 47, 48, 49,
56, 57, 58, 59,
67, 68, 69
78, 79,
89.
In a combination, the order of the elements DOES NOT MATTER.
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How many 4 number combinations are there in 4 numbers?
-- 4 numbers can be lined up in 24 different ways-- If the order doesn't matter, then there's only one4-number combination of 4 numbers.
How many 5 number combination are there for numbers 1 - 39 when one of the numbers is 9?
277612920, but only if any number (including 9) can appear more than once.
How many numbers in a billion?
a billion numbers
How many 4 digit numbers can you write using only the digits 2 and 5?
With each digit having only 2 possibilities, the answer is 2 to the 4th power, which is 16. The 4 is because there are 4 digits. Think about the binary numbers 0000 to 1111, there are 2 possibilities for each digit. If your constraint is that the digits must have at least one 2 and at least one 5, then eliminate the two combinations 2222 and 5555, and that answer would be 14.
A closed polygon has 14 diagonals. how many numbers of sides does it have?
It will have 7 sides
How many combinations of six numbers can be had from seven numbers?
The number of combinations of six numbers that can be made from seven numbers will depend on if you can repeat numbers. In all there are over 2,000 different numbers that can be made.
How many 4 number combinations can be made from 9 numbers?
9!/5! or 3024
How many different 6 number combinations can be made of 8 numbers?
8C6 = 28
How many 2 number combinations can be made out of 7 numbers?
2 to the 7th power = 128 * * * * * No. That is the total number of combinations, consisting of any number of elements. The number of 2 number combinations is 7*6/2 = 21
How many five number combinations can you get from 6 numbers?
252 combinations, :)
How many 4 number combinations can be made out of 3 numbers?
None. You do not have enough numbers to make even one combination.
How many combinations can you make with the numbers 2 3 6 7 and 8?
You can make 5 combinations of 1 number, 10 combinations of 2 numbers, 10 combinations of 3 numbers, 5 combinations of 4 numbers, and 1 combinations of 5 number. 31 in all.
How many 1 letter and 1 number combinations can be made from 5 numbers and 4 letters?
20
How many 6 number combinations in 138?
There are 8,592,039,666 combinations of 6 numbers out of 138 numbers, like the numbers from 1 to 138.
How many combinations of 5 are there in 0 to 10 numbers?
There are a huge number of combinations of 5 numbers when using the numbers 0 through 10. There are 10 to the 5th power combinations of these numbers.
How many 4 digit combinations can be made from the numbers 0 to 9?
If every number can be used as many times as you like, there are 104 = 10000 different combinations. If each number can only be used once, there are 9!/(9 - 4)! = 5040 combinations.
What are the 5-number combinations not using any number twice?
There are infinitely many numbers and so infinitely many possible combinations.
