Multiple choice

Find the missing number in given series: 80, 84, 75, 91, __, 102.

  1. 66

  2. 72

  3. 76

  4. 86

  5. 60
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A Correct answer
Explanation

The series follows an alternating pattern: +4, -9, +16, -25, +36. Starting from 91, 91 - 25 = 66. Then 66 + 36 = 102, which matches the series.

AI explanation

The series follows an alternating addition and subtraction pattern using consecutive squares. We add 4 to 80 to get 84, subtract 9 from 84 to get 75, and add 16 to 75 to get 91. Following this pattern, we subtract 25 from 91 to get 66, and then add 36 to 66 to get 102. Thus, the missing number is 66.

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