Find the wrong term from the following series: 1, 6, 16, 31, 51, 76, 106, 140,…

Key idea: the sequence is formed by adding increments that increase by 5 each time (5, 10, 15, ...).

1. 1 + 5 = 6

2. 6 + 10 = 16

3. 16 + 15 = 31

4. 31 + 20 = 51

5. 51 + 25 = 76

6. 76 + 30 = 106

7. 106 + 35 = 141 (expected term)

8. 141 + 40 = 181

9. 181 + 45 = 226

Check the given term 140:

106 + 34 = 140, which uses an increment of 34 instead of the required 35. This breaks the consistent pattern of increasing increments by 5.

Conclusion: the wrong term is 140; the correct value in that position should be 141.