Question

find the sum of first 20 positive integers​

Answer 1

Answer:

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Step-by-step explanation:

The answer is 210

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Answer 2

The formula for the sum of the first #n# integers is:

#(n(n + 1))/2#

Substituting #20# for #n# and evaluating the expression gives:

#(20(20 + 1))/2 => (20 * 21)/2 = 420/2 = 210#

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