Correct Answer - Option 2 : 1182

**Given:**

The average of five numbers = 612

The average of the first two numbers = 418

The average of the last two numbers = 521

**Concept used:**

Average = sum of elements/number of elements

**Calculation:**

Sum of all five numbers = 612 × 5 = 3060

Sum of first two numbers = 418 × 2 = 836

Sum of last two numbers = 521 × 2 = 1042

Sum of all five numbers = Sum of first two numbers + third number + Sum of last two numbers

3060 = 836 + third number + 1042

Third number = 3010 - 836 - 1042 = 1182

**∴ The third number is 1182.**