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 Apr 8 awarded Teacher Mar 1 revised Finite Automaton that accepts only the words baa,ab, abb and no other strings longer or shorter fixed grammar Mar 1 suggested approved edit on Finite Automaton that accepts only the words baa,ab, abb and no other strings longer or shorter Nov 22 comment How to explain that division by $0$ yields infinity to a 2nd grader @HagenvonEitzen with this reasoning what would have you said the first time someone said i² = -1 ? ERROR like the stup** windows calc ? Jul 27 comment How to detect when continued fractions period terminates That's what Gerry Myerson answered but it only applies to square roots, sorry ! Jul 27 answered How to detect when continued fractions period terminates Jul 5 awarded Student Jul 5 awarded Scholar Jul 5 accepted Compute $\sum_0^{n-1}2^i11^{n-i-1}\bmod10^9$ when $n=13^{17}$ Jul 5 comment Compute $\sum_0^{n-1}2^i11^{n-i-1}\bmod10^9$ when $n=13^{17}$ Now it becomes easy as pie :) thank you ! Jul 5 awarded Editor Jul 5 revised Compute $\sum_0^{n-1}2^i11^{n-i-1}\bmod10^9$ when $n=13^{17}$ Just added a \cdot line 3 Jul 5 asked Compute $\sum_0^{n-1}2^i11^{n-i-1}\bmod10^9$ when $n=13^{17}$ Nov 9 awarded Supporter