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 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. Mar8 comment Solve a Quadratic map @Sabyasachi: Yes but how do you propose to get $S_n$ without computing $S_{n-1}$? Mar8 comment Quadratic Map Solution Ok.Any way to reduce it? 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? Jun4 comment General term of this sequence Then how did they generate the sequence up to 1000 terms? Feb2 comment No. of ways of selecting more than 50% of the elements it wasn't multiplied. Clear now? Feb2 comment No. of ways of selecting more than 50% of the elements @Maesumi 5 is the no. of ways of selecting out of 4 objects as per the constraints of the question Jan9 comment Condition for a point to lie between two lines what do you mean by weak inequalities? Dec15 comment Proof of test of collinearity and coplanarity What?? You mean to say that 3 points cannot be collinear??? Nov29 comment Area of an ellipse Then could you specify the major and minor axis in terms of the constants in the given equation. Nov15 comment Finding the degree and coefficients of the Polynomial By your logic, $421350 - 17$ should be divisible by $3$ (20-17) right? Nov15 comment Finding the degree and coefficients of the Polynomial SO the polynomial doesn't exist. Nov9 comment Setting A Paper on Mathematical Puzzles I know, I am scanning thorugh. I asked for help if you could suggest some good ones out of them. Nov9 comment Setting A Paper on Mathematical Puzzles I meant to set a question paper. Nov4 comment Alice and Bob Game @DouglasS.Stones These are archived questions. They are not part of any live tournaments. Hence there is no harm in asking any of these for an optimal solution. Oct27 comment Range of a trignonmetric function Could you please review your answer, the question was slightly wrong.