diff --git a/src/1_complex_numbers.md b/src/1_complex_numbers.md
index 26b4b630fb8ece389111ec3dc2d18ac90e9b8690..550cb4680199d16cad65d5c37eba35e395622728 100644
--- a/src/1_complex_numbers.md
+++ b/src/1_complex_numbers.md
@@ -254,11 +254,11 @@ function helps in re-deriving trigonometric identities.
 
 ## Problems
 
-1.  [:grinning:]  Given $a=1+2\rm i$ and $b=4-2\rm i$, calculate and draw in the
-    complex plane the numbers $a+b$, $a-b$, $ab$, and $a/b$.
+1.  [:grinning:]  Given $a=1+2\rm i$ and $b=-3+4\rm i$, calculate and draw in the
+    complex plane the numbers $a+b$, $ab$, and $b/a$.
 
 2.  [:grinning:] Evaluate (a) $\rm i^{1/4}$, (b)
-    $\left(-1+\rm i \sqrt{3}\right)^{1/2}$, (c) $\exp(2\rm i^3)$.
+    $\left(1+\rm i \sqrt{3}\right)^{1/2}$, (c) $\exp(2\rm i^3)$.
 
 3.  [:grinning:] Find the three 3rd roots of $1$ and ${\rm i}$ (i.e. all possible solutions to the equations $x^3 = 1$ and $x^3 = {\rm i}$, respectively).