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 Oct 23 awarded Scholar Oct 23 accepted Combination of 4 digits 1 digit is repeated Oct 23 revised Combination of 4 digits 1 digit is repeated edited tags Oct 23 asked Combination of 4 digits 1 digit is repeated Sep 24 awarded Autobiographer Jun 7 awarded Supporter Mar 20 revised Radius of in-circle English fix Mar 20 suggested approved edit on Radius of in-circle Mar 19 answered Did I write the right “expressions”? Mar 15 awarded Organizer Mar 15 revised Greatest integer function add homework tag Mar 15 suggested approved edit on Greatest integer function Mar 14 suggested rejected edit on Prove $F(x)=\frac{1}{x}\int_0^xf(t)$ is convex Mar 13 answered How many permutations? Mar 13 answered How many permutations? Mar 12 awarded Teacher Mar 12 awarded Editor Mar 12 comment Closed Infinite intervals I am not a pure math student, but try this pdf page 4, does it help? Mar 12 answered How to simplify this square $(3 \times 4 + 2)^2$? Mar 12 answered How many ways can four letters abcd be arranged such that a always comes before b and c always comes before d?