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39+38+...+1 = 39*38/2 = 494

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Q: How many cobinations of 2 numbers 1 to 40?
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Related questions

How many prime numbers are there between 1-40?

Twelve: 2,3,5,7,11,13,17,19,23,29,31,37.


What 2 numbers can you multipy to make 40?

There are infinitely many pairs. The simplest to find is 1 and 40.


How many numbers between 30 and 40 are perfect square?

the answer is 1. there is only 1 perfect square beteen 30 and 40.


How many numbers are between 40 and 50?

There are 9 numbers between 40 and 50, inclusive. This can be calculated by subtracting the starting number (40) from the ending number (50) and then adding 1 to include both 40 and 50 in the count. So, 50 - 40 + 1 = 9 numbers between 40 and 50.


What are theSquare numbers between 1 and 40?

Depends how many sides the square has.


What is the equivalent fraction to 40?

There are many solutions but the easiest is 40/1. You can use any two numbers as long as the quotient of the two will be 40.


How many even numbers up to 100 are there starting from 40?

If you count 40 and 100, there's 61. 100-40+1=61


What two numbers can you multiply to get 40?

How about 40 and 1.


What are the composite numbers below 40?

1,4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,35,36,38,39 are the composite numbers between 1 and 40.


How many 6 number combination's are there in the numbers 1 to 6?

40 dhjfdsm dlgkDRFRt


How many eighths go into 5 wholes numbers?

5 / (1/8) = 5*8/1 = 40


How many composite numbers are there from 1 to 40?

Look up a table of prime numbers. All those numbers that are not prime, are composite - except 1, which is neither prime nor composite.