Which one does NOT belong?

Exercise and reference answers

Questions

1. Items

   1. Common difference
   2. Real part
   3. Imaginary part
   4. Modulus

   Reason

   Common difference belongs to arithmetic progressions, not to complex numbers.

   Odd item

   Common difference

2. Items

   1. i squared is minus one
   2. i squared is one
   3. i to the fourth is one
   4. i cubed is minus i

   Reason

   i squared is minus one, never one. The other three statements are correct.

   Odd item

   i squared is one

Instructions

Tap the item that does not belong with the rest.

Explanation