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f(n) = (n² + n) / 2 f(1) = (1² + 1) / 2 = 1 f(2) = (2² + 2) / 2 = 3 f(3) = (3² + 3) / 2 = 6 f(4) = (4² + 4) / 2 = 10 f(5) = (5² + 5) / 2 = 15 f(6) = (6² + 6) / 2 = 21
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F u times 2 means f*** you times twice
I think you might mean f(x)+2? Or do you mean f(x+2)? Either way it depends on what f(x) is.
3/6 + 1/f = 1/2 + 1/f = (f+2)/2f