Problem from the 2020 Latvian "Sophomore's Dream" competition
67907
Evaluating $\int_{-a}^a \frac{f(x)+1}{b^x+1}\,\mathrm dx$ for a $y$-axis symmetrical function $f$
20287
Convergence Problem.
26898
Trouble solving two number theoretical problems
121605
A coin tossing game which leads to a contradiction
127311
Challenging probability problem
68882
Path to Combinatorics Problem [$1.11$]
101804
Problem concerning the use of Pigeonhole (Box) principle
3601
A problem about Vandemonde matrix
157208
Statistics: Bertrand's Box Paradox
32050
"World's Hardest Easy Geometry Problem"
132070
A challenge on the parabola
12291
Two envelope problem revisited
83222
using trial and error in math problems
68991
The coupon collectors problem
157899
Matrix problem similar to Problem 3, SEEMOUS 2019
59675
A inequality proposed at Zhautykov Olympiad 2008
10839
Problem in Cardinality and Order