In the number series given below, which one of the following options will appear at the place marked (?) ? 14, 8, 5, ? , 2.75

The correct answer is (b) 3.25.

In this number series, each number is 3/4 of the number before it. So, 8 is 3/4 of 14, 5 is 3/4 of 8, and 2.75 is 3/4 of 5. Therefore, the next number in the series is 3/4 of 2.75, which is 3.25.

Here is a step-by-step solution:

1. 14 / 3/4 = 8
2. 8 / 3/4 = 5
3. 5 / 3/4 = 2.75
4. 2.75 / 3/4 = 3.25

Therefore, the next number in the series is 3.25.