The number of terms in the expansion of $(x + y)^{12}$ equals _____.
Step-by-Step Solution
Key Concept: Recall that the expansion of $(a + b)^n$ always has exactly $n + 1$ terms, with exponents of $a$ running from $n$ down to $0$.
The detailed step-by-step mathematical proof is available inside the Mathbee app workspace.
Correct Answer: 13