diff --git a/_posts/2024-11-07-coa-four.md b/_posts/2024-11-07-coa-four.md
index 858fddc114d9..1cbcfd3ba586 100644
--- a/_posts/2024-11-07-coa-four.md
+++ b/_posts/2024-11-07-coa-four.md
@@ -220,4 +220,14 @@ Decimal value 14D = 1110B = 0EH
 | 201 	|        500       	|   /  	|
 | 202 	| Next Instruction 	|   /  	|
 
+**Answer**:
+
+- *Direct*: EA = 500, Operand = 1100
+- *Immediate*: EA = (not applicable), Operand = 500
+- *Indirect*: EA = 1100, Operand = 1700
+- *Register*: EA = (not applicable) or R1, Operand = 400
+- *Register Indirect*: EA = 1000, Operand = 1600
+- *PC Relative*: EA = 702, Operand = 1302
+- *Displacement* EA = (Base Reg) + A = 600, Operand = 1200
+- *Autoindexing with increment, using R1*: EA = 400, Operand = 1000, *after operate this, (R1) = (R1) + 1*