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Use the formula for finding the sum 1+2+3+ ... +n to discover a formula for finding the sum 11 +22+33+...+11n. The formula for the

Use the formula for finding the sum 1+2+3+ ... +n to discover a formula for finding the sum 11 +22+33+...+11n. The formula for the sum 11+22+33+ +11n is S= (Simplify your answer. Use whole numbers or fractions for any numbers in the expression.)

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