Multiple choice

Find the missing number in the following number series- 80 ? 144 420 1664 8300

  1. 90

  2. 96

  3. 84

  4. 86

  5. 76
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Pattern: n × position_number - 20 × position_number. 76 × 2 - 40 = 152 - 40 = 112 (no). Pattern: multiply by 1, 2, 3, 4, 5 and subtract 4, 8, 12, 16, 20 respectively. 76 × 2 - 8 = 144, 144 × 3 - 12 = 420, 420 × 4 - 16 = 1664, 1664 × 5 - 20 = 8300. Checking first term: 80 × 1 - 4 = 76. Correct. Missing number is 76.

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