Wrong number in the given series is:
7, 28, 63, 124, 215, 342, 511

Question

Accepted Answer

1. **Understand the pattern**:  
   The correct sequence follows the formula $$ n^3 - 1 $$, where $$ n $$ is a positive integer.

2. **Verify each term**:  
   - For $$ n = 2 $$: $$ 2^3 - 1 = 7 $$ (Correct).  
   - For $$ n = 3 $$: $$ 3^3 - 1 = 26 $$, but the series has **28**, which is incorrect.  
   - For $$ n = 4 $$: $$ 4^3 - 1 = 63 $$ (Correct).  
   - For $$ n = 5 $$: $$ 5^3 - 1 = 124 $$ (Correct).  
   - For $$ n = 6 $$: $$ 6^3 - 1 = 215 $$ (Correct).  
   - For $$ n = 7 $$: $$ 7^3 - 1 = 342 $$ (Correct).  
   - For $$ n = 8 $$: $$ 8^3 - 1 = 511 $$ (Correct).

3. **Conclusion**:  
   The wrong term is **28**, as it should have been **26** based on the formula.

Thus, the correct answer is **(c) 28**.

Answer

Answer

Answer