31 Answered Questions

[SOLVED] Sum of First $n$ Squares Equals $\frac{n(n+1)(2n+1)}{6}$

9 Answered Questions

6 Answered Questions

3 Answered Questions

8 Answered Questions

6 Answered Questions

6 Answered Questions

5 Answered Questions

2 Answered Questions

2 Answered Questions

[SOLVED] Counting number of moves on a grid

5 Answered Questions

5 Answered Questions

[SOLVED] $A \oplus B = A \oplus C$ imply $B = C$?

6 Answered Questions

[SOLVED] General formula for the 1; 5; 19; 65; 211 sequence

4 Answered Questions

5 Answered Questions

[SOLVED] Show that if $g \circ f$ is injective, then so is $f$.

3 Answered Questions

[SOLVED] Prove $f(S \cup T) = f(S) \cup f(T)$

2 Answered Questions

4 Answered Questions

[SOLVED] Sum of cubes proof

2 Answered Questions

2 Answered Questions

[SOLVED] Choosing numbers without consecutive numbers.

2 Answered Questions

8 Answered Questions

[SOLVED] What is $\gcd(0,0)$?