Ace the AMC
# Intro to AMC

Often, it's useful to think about an **extreme case** of a problem. Then, you can check if that extreme case is possible, and if not, how close you can get.

What is the maximum number of coins that can be placed on squares in an \(8\times 8\) chessboard such that each row, each column, and each long diagonal contains at most 4 coins? (Note: Only 1 coin is allowed per square.)

When solving questions about a general variable, it can be useful to **test small cases and then make a conjecture** about the overall problem.

Find the sum of primes \(p\) such that \(p^2+11\) has exactly six different positive divisors (including 1 and the number itself).

When a problem involves some sort of **symmetry**, make use of it!

If 6 fair coins are flipped, what is the probability that there are more heads than tails?

**Hint:** What is the probability that the same number of heads and tails are flipped, and what are the other possibilities?

On the AMC, **eliminating impossible or unlikely choices** makes guessing much more beneficial.

You encounter the question below, but your paper has been smudged. Nonetheless, you can still answer the question correctly!

For all positive integers \(n,\) the expression above is always divisible by all of the following positive integers except one. Which one?

**Casework** is a wide-reaching strategy of breaking a complex problem down into multiple cases - each of which is relatively simple - and then combining them to obtain the overall result.

Find the sum of all solutions to the equation

\[ \large (x^2+5x+5)^{x^2-10x+21}=1 .\]

**Hint:** Don't forget about the case where the base is \(-1\) and the exponent is even!

These introductory quizzes have given you just a glimpse of what's to come in Ace the AMC.

Whether you're looking for a comprehensive guide (with over 50 quizzes in a wide range of topics) or just looking to brush up on some specific techniques, there's something here for you. **Dive in, and good luck!**

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