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 Apr15 awarded Popular Question Apr7 accepted No. of ways of selecting more than 50% of the elements Feb12 awarded Notable Question Jul2 awarded Curious Jun7 comment Prove that maximum 9 trailing zeroes in this summation @tpb261 'Maximum' 9 trailing zeros. Jun6 comment Prove that maximum 9 trailing zeroes in this summation acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3549 Jun6 comment Prove that maximum 9 trailing zeroes in this summation Sorry for the inconvenience, question updated. Jun6 revised Prove that maximum 9 trailing zeroes in this summation added 15 characters in body Jun6 asked Prove that maximum 9 trailing zeroes in this summation Mar8 comment Solve a Quadratic map @Sabyasachi: Yes but how do you propose to get $S_n$ without computing $S_{n-1}$? Mar8 revised Solve a Quadratic map deleted 4 characters in body Mar8 asked Solve a Quadratic map Mar8 revised Quadratic Map Solution added 71 characters in body Mar8 revised Quadratic Map Solution added 9 characters in body Mar8 comment Quadratic Map Solution Ok.Any way to reduce it? Mar8 asked Quadratic Map Solution Jan28 awarded Popular Question Dec8 comment Combinatorial Number System @BrianM.Scott, yes. But when I meant find the 6th combination of {1,2,3}, it meant directly getting the answer as {1,3} without having precomputed the previous combinations and having ordered them. According to CNS I think this is possible when repetitions are not allowed, but I am not able to extend it to cases where repetition are allowed. Dec8 comment Combinatorial Number System @BrianM.Scott I am assuming that each set is listed in non-decreasing or lexicographic order. But how does that reduce it to finite sequences? Dec8 comment Combinatorial Number System @AbishankaSaha, I have edited the question. Get it, now?