Multiple choice

Directions: Find the missing number in the following series: 3, 15, 37, 69, 111, ?

  1. 124

  2. 156

  3. 161

  4. 163

  5. None of these
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D Correct answer
Explanation

Differences: 15-3=12, 37-15=22, 69-37=32, 111-69=42. The differences increase by 10. Next difference is 52. 111 + 52 = 163.

AI explanation

The series follows a pattern of increasing differences, where the first difference is 12 (15 - 3), the second is 22 (37 - 15), the third is 32 (69 - 37), and the fourth is 42 (111 - 69). Following this rule, the next difference must be 52 (which is 25). Adding 25 to 111 gives the missing term as 163.

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