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 May 23 comment $x^n + y^n = z^n$, $n>1$ To show that $x,y,z$ is greater than $n$ Thanks @TonyK, if it is not too much, can I ask how do people think of such inequalities. I mean I would never have thought of $nx^{n-1}$ ever by myself. May 23 comment $x^n + y^n = z^n$, $n>1$ To show that $x,y,z$ is greater than $n$ I am sorry, I still don't get it. May 14 comment Recursive Hexagon Problem to find number of hexagons at each stage could you expand on this part :" because you'll adding a hexagon whose six edges each consist of i+1 cells, " May 14 comment A mathematical puzzle Current Codechef Contest Problem.(codechef.com/MAY15/problems/SETDIFF) All this users problems posted recenty are Codechef Contest problems. [1]: Jun 7 comment Prove that maximum 9 trailing zeroes in this summation @tpb261 'Maximum' 9 trailing zeros. Jun 6 comment Prove that maximum 9 trailing zeroes in this summation acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3549 Jun 6 comment Prove that maximum 9 trailing zeroes in this summation Sorry for the inconvenience, question updated. Mar 8 comment Solve a Quadratic map @Sabyasachi: Yes but how do you propose to get $S_n$ without computing $S_{n-1}$? Mar 8 comment Quadratic Map Solution Ok.Any way to reduce it? Dec 8 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. Dec 8 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? Dec 8 comment Combinatorial Number System @AbishankaSaha, I have edited the question. Get it, now? Jun 4 comment General term of this sequence Then how did they generate the sequence up to 1000 terms? Feb 2 comment No. of ways of selecting more than 50% of the elements it wasn't multiplied. Clear now? Feb 2 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 Jan 9 comment Condition for a point to lie between two lines what do you mean by weak inequalities? Dec 15 comment Proof of test of collinearity and coplanarity What?? You mean to say that 3 points cannot be collinear??? Nov 29 comment Area of an ellipse Then could you specify the major and minor axis in terms of the constants in the given equation. Nov 15 comment Finding the degree and coefficients of the Polynomial SO the polynomial doesn't exist. Nov 9 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.