diff --git a/README.md b/README.md
index fadaf4b..c92662c 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,6 @@
 66 + 75 = 141
 33 / 5 = 6
 40 + 53 = 93
-91 - 71 = 20
 38 + 39 = 77
 12 * 39 = 468
 87 + 39 = 126