1. **Problem stated:** The question is asking what the world’s hardest math problem is. 2. **Important rule:** There is no single universally agreed “hardest” math problem, because different areas of mathematics have different famous open problems. 3. **Common answer:** Many people point to the **Riemann Hypothesis** as one of the hardest and most famous unsolved problems in mathematics. 4. **Formula used:** The Riemann zeta function is written as $$\zeta(s)=\sum_{n=1}^{\infty}\frac{1}{n^s}$$ for values of $s$ where the series makes sense. 5. **Why it is famous:** The Riemann Hypothesis asks whether all the nontrivial zeros of $\zeta(s)$ have real part exactly $\frac{1}{2}$. 6. **Plain explanation:** If this is true, it would deeply improve our understanding of prime numbers. 7. **Another famous contender:** The **P vs NP problem** is also considered one of the hardest problems in math and computer science. 8. **Final answer:** There is no official single hardest math problem, but the **Riemann Hypothesis** and **P vs NP** are among the most famous and difficult unsolved problems.