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### Questions (4)

 6 What is the volume of $A'EF-ABD$? 2 Show that $x^2+15y^2=4^n$ has at least $n$ non-negative integer solutions 2 How to prove $A^x\equiv A^{x\: \bmod\: \varphi (c)+\varphi (c)}(\bmod\: c)(x\geq \varphi (c))$? 0 Show that $\lim_{n \to \infty }(nx^{n+1}-(n+1)x^n)=0$

### Reputation (109)

 +25 How to calculate sum of combinations with different n and k +25 Number of the term +30 What is the volume of $A'EF-ABD$? +5 Show that $x^2+15y^2=4^n$ has at least $n$ non-negative integer solutions

 1 How to calculate sum of combinations with different n and k 1 Number of the term

### Tags (12)

 1 number-theory × 2 1 arithmetic 1 sequences-and-series 1 binomial-coefficients 1 linear-algebra 1 contest-math 1 modules 0 elementary-number-theory 1 multisets 0 geometry

### Accounts (8)

 Mathematics 109 rep 7 MathOverflow 8 rep 5 Stack Overflow 1 rep 1 TeX - LaTeX 1 rep 1 Ask Ubuntu 1 rep 1