Spot the one that does not belong

Exercise and reference answers

Questions

1. Items

   1. Mean
   2. Closure
   3. Commutativity

   Odd item

   Mean

2. Items

   1. 0
   2. 2
   3. 1

   Odd item

   2

3. Items

   1. a + b = b + a
   2. ab = ba
   3. a(b + c) = ab + ac

   Odd item

   a(b + c) = ab + ac

Explanation