Explanation:

- To find the missing number in the series, first observe the pattern between consecutive numbers.

- The series: 108, 99, 88, ?, 60, 43 shows a pattern of decreasing numbers.

- Calculate the difference between each pair of numbers:

- 108 to 99 is a decrease of 9.

- 99 to 88 is a decrease of 11.

- Notice the difference of the differences: 11 - 9 = 2.

- Assume the differences continue increasing by 2.

- Thus, the next difference after 11 should be 13.

- Subtract 13 from 88:

- 88 - 13 = 75.

- Confirm the given options:

- Option 1: 76

- Option 2: 75

- Option 3: 78

- Option 4: 77

- Correct Answer is Option 2: 75.

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