SAT · Mathematics · Polynomial / Number — Odd One Out

Exercise and reference answers

Questions

1. Items

   1. x² + 5x + 6
   2. x² + 6
   3. x² − 5x + 6
   4. x² + 4x + 4

   Reason

   x² + 6 has no linear term; the others factor into binomials.

   Odd item

   x² + 6

2. Items

   1. 1/2
   2. 0.5
   3. 2/3
   4. 5/10

   Reason

   2/3 is not equal to 0.5; the others are.

   Odd item

   2/3

3. Items

   1. sin 30°
   2. cos 60°
   3. 1/2
   4. √2/2

   Reason

   √2/2 ≈ 0.707 (= sin 45°); the others equal 1/2.

   Odd item

   √2/2

4. Items

   1. 1, 1, 2, 3
   2. 2, 4, 6, 8
   3. 3, 6, 9, 12
   4. 5, 10, 15, 20

   Reason

   1, 1, 2, 3 is Fibonacci; the others are arithmetic progressions.

   Odd item

   1, 1, 2, 3

Instructions

Tap the item that doesn't fit the pattern.