Find the total number of terms in the expansion of (x + a)^11 - (x - a)^11 after simplification.
+287 Let $A$ be the number of terms in the expansion of $(x+a)^{11}$. (This $A$ is also the number of terms in the expansion of $(x-a)^{11}$.) Let $B$ be the number of terms in the expansion of $(x+a)^{11}$ that are the same as the terms in the expansion of $(x-a)^{11}$. The answer is $A-B$.
