1Rimuru 1Rimuru

19-01-2023
Mathematics

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Can anyone please help me answer this question?
Show that the following statement is true for all natural numbers n
a. 1 + 2 + 3 + ⋯ + = n (n + 1)/ 2
b. 1 + 4 + 7 + ⋯ . +(3 − 2) = n (3n - 1)/ 2

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