Monthly Archives: January 2011

How big is the infinity?

For sure we all remember from highschool (or university if you are not Romanian 🙂 ) that the harmonic series converges to infinity: This can be proved with Lagrange theorem  🙂  applied for logarithmic function. Maybe I’ll add a post … Continue reading

Posted in Math | Leave a comment

In how many different ways can you scramble the word ‘abracadabra’?

Apparently the solution is   because ‘abracadabra’ has 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

Posted in Math | 1 Comment