Question 154
Find all natural numbers $a$, $b$ and $n$ such that the following equation holds:
$$
a! + b! = 2^{n}
$$
$$
a! + b! = 2^{n}
$$
MathNet 2004 — Part 01 Question 154
Math Olympiad Vault · MathNet 2004 — Part 01
Math Olympiad Vault · MathNet 2004 — Part 01