30. Find 1 + 2 + 3 + ... + n (multiplication and division, loop, if, switch cannot be used) - Code World

30. Find 1 + 2 + 3 + ... + n (multiplication and division, loop, if, switch cannot be used)

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30. Find 1 + 2 + 3 + ... + n (multiplication and division, loop, if, switch cannot be used)

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