diff --git a/chapter01/src/test/scala/sofp/unit/Exercise1.1.scala b/chapter01/src/test/scala/sofp/unit/Exercise1.1.scala
deleted file mode 100644
index af4a515..0000000
--- a/chapter01/src/test/scala/sofp/unit/Exercise1.1.scala
+++ /dev/null
@@ -1,13 +0,0 @@
-package sofp.unit
-
-import com.eed3si9n.expecty.Expecty.expect
-
-import munit.FunSuite
-
-class Exercise1_1 extends FunSuite {
-
-  test("exercise 1.1") {
-    expect(0 == 0)
-  }
-
-}
diff --git a/chapter01/src/test/scala/sofp/unit/Exercises_1_6_1.scala b/chapter01/src/test/scala/sofp/unit/Exercises_1_6_1.scala
new file mode 100644
index 0000000..60b1e38
--- /dev/null
+++ b/chapter01/src/test/scala/sofp/unit/Exercises_1_6_1.scala
@@ -0,0 +1,17 @@
+package sofp.unit
+
+import com.eed3si9n.expecty.Expecty.expect
+
+import munit.FunSuite
+
+class Exercises_1_6_1 extends FunSuite {
+
+  test("exercise 1.6.1.1") {
+
+    def staggeredFactorial(n: Int): Int = (n to 1 by -2).product
+
+    expect(staggeredFactorial(8) == 384)
+    expect(staggeredFactorial(9) == 945)
+  }
+
+}