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Asked by Anonymous

Look for a pattern in the expressions shown below. Use the pattern to write an expression for the sum of the whole numbers from 1 to n. Then find the sum of the whole numbers from 1 to 50.

1+2= 2•3/2 1+2+3= 3•4/2 1+2+3+4= 4•5/2
12 years ago

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Answered by Steve
1+...+n = n(n+1)/2
12 years ago
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Look for a pattern in the expressions shown below. Use the pattern to write an expression for the sum of the whole numbers from 1 to n. Then find the sum of the whole numbers from 1 to 50.

1+2= 2•3/2 1+2+3= 3•4/2 1+2+3+4= 4•5/2

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