Solving the following:
10917
Give a combinatorial proof: $ n(n+1)2^{n-2} = \sum_{k=1}^{n}k^2\binom{n}{k} $
113407
Finding all solutions for a system of equations with constraint on the sum of absolute values
28594
Number of integer solutions of the following equation
133236
Euler's Solution of Seven Bridges of Königsberg in Layman Terms
87976
How to solve these series?
41205
Help me solve a combinatorial problem
132346
a linear algebra multiple choice problem
79485
Problem with solving systems of linear congruence of two variables
41534
A system of logarithmic equations with parameters
66933
Solving an exponential equation with different bases
107964
Simple combinatorics problem.
119407
Solution of Vector equation
94965
Solve $x\equiv 1\pmod2$, $x\equiv 2\pmod3$, $x\equiv 3\pmod4$, $x\equiv 4\pmod5$, $x\equiv 5\pmod6$ and $x\equiv 0\pmod7$
135074
How do you solve this equation?
117254
Solving a implicit, recursive function
26689
A.P. terms in a Quadratic equation.
130670
Solving Integrals