Multiple choice

Directions: Find the wrong term in the following series. 85, 185, 390, 805, 1640, 3210, 6670

  1. 390

  2. 1640

  3. 3210

  4. 6670

  5. None of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pattern: 85*2+15=185, 185*2+20=390, 390*2+25=805, 805*2+30=1640, 1640*2+35=3315. The term 3210 is incorrect; it should be 3315.