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For sure we all remember from highschool (or university if you are not Romanian đź™‚ ) that the harmonic series converges to infinity: This can be proved with Lagrange theoremÂ đź™‚ Â applied for logarithmic function. Maybe I’ll add a post … Continue reading
Apparently the solution isÂ Â because ‘abracadabra’ hasÂ 11 letters. But this is not correct because replacing first ‘a’ with the last ‘a’ for example would not give a different solution, and by simply using permutations we count some words more than … Continue reading