3/6 + 1/f = 1/2 + 1/f = (f+2)/2f
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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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4 d 5 e 6 f
To evaluate a formula is to try and solve or simplify it. For instance f(x) = 2x*4x-1x+6 f(x) = 7x+6 f(3) = 7*3+6
its Mersenne's Number f(n)= (2^n) -1 where n is the number of sequence. so f(1) = 1 f(2) = 3 f(3) = 7 f(4) = 15 f(5) = 31 ...