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The sum of the numbers from 1 to 20 inclusive is 220.

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The sum of the first six counting numbers (1-6) is 19.

The sum of the first 10 counting numbers (1-10) is 51.

The sum of the first 100 counting numbers (1-100) is 5,001.

1+1+1+1+1+=5 * * * * * The question did not ask for the sum of the first counting number five times! The sum of the first 5 counting numbers is 1+2+3+4+5 = 15. Such sums are known as triangular numbers.

The sum of the first 500 counting numbers (1-500) is 125,001.

1, 2, 3, and 5

1 and 3

105

20 and 1. 20 + 1 = 21 20 - 1 = 19

I assume you mean the first three "counting" (ordinal) numbers, which are 1, 2, and 3. The sum is therefore 1 + 4 + 9 = 14.

It is 75.

How many counting numbers have three distinct nonzero digits such that the sum of the three digits is 23?

21

(1 + 20) x (20/2) ie 210

The sum of the squares of the first 20 natural numbers 1 to 20 is 2,870.

The counting numbers from 1 to 20 are called natural numbers. There are larger sets that include the numbers from 1 to 20, but have other members as well. For example, the integers contain 1 through 20, but also all numbers 21, 22, 23, ... The set of real numbers includes all numbers on the number line, which includes 0 and negative numbers and irrational numbers like pi, but also includes 1 through 20. Etc.

There are (not counting 1) three square numbers between 1 and 20.

The sum of the first N square numbers is: N*(N+1)*(2N+1)/6 So putting N = 20 gives 2870.

Sum of 1,2, ... , n is n*(n+1)/2 Here, n = 25 so sum = 25*26/2 = 325

1 and 20.

Just 1

Usually all the integers (counting numbers) from 1 to 100.Usually all the integers (counting numbers) from 1 to 100.Usually all the integers (counting numbers) from 1 to 100.Usually all the integers (counting numbers) from 1 to 100.

Negative numbers are not counting numbers. Counting numbers are the integers starting with 1 and then 2 and so forth.

Suppose the numbers are x and y Then the sum of their reciprocals is 1/x + 1/y = y/xy + x/xy = (y+x)/xy = 10/20 = 1/2

Choose one odd and one even