Which one does NOT belong?

Exercise and reference answers

Questions

1. Items

   1. Distance formula
   2. Section formula
   3. Quadratic formula
   4. Midpoint formula

   Reason

   The quadratic formula solves equations. The other three belong to coordinate geometry.

   Odd item

   Quadratic formula

2. Items

   1. x coordinate
   2. y coordinate
   3. Origin
   4. Common difference

   Reason

   Common difference belongs to arithmetic progressions, not to the coordinate plane.

   Odd item

   Common difference

Instructions

Tap the item that does not belong with the rest.

Explanation