What should come in place of the question mark '?' in the following number series?

5, 25, 61, 113, ?

- 101
- 181
- 162
- 143
- 171

Option 2 : 181

The series follows the following pattern:

12 + 22 = 5

32 + 42 = 25

52 + 62 = 61

72 + 82 = 113

92 + 102 = 181

∴ The missing term in the series is 181.

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