1. The problem asks for the formula for addition, which is the operation of combining two numbers to get their total. 2. The addition formula is simply written as: $$a + b = c$$ where $a$ and $b$ are the numbers being added, and $c$ is their sum. 3. For example, if $a = 3$ and $b = 5$, then: $$3 + 5 = 8$$ 4. Addition is commutative, meaning: $$a + b = b + a$$ and associative, meaning: $$(a + b) + c = a + (b + c)$$ This makes addition a fundamental operation in arithmetic and algebra.