4000 2000 1000 500 250 125 ?

Options

A. 80
B. 65
C. 62.5
D. 83.5

Explanation

To solve the series: 4000, 2000, 1000, 500, 250, 125, ?, we need to identify the pattern in the sequence.

### Step-by-Step Solution:

1. **Identify the Pattern**:
We observe the numbers in the series:
- 4000 to 2000
- 2000 to 1000
- 1000 to 500
- 500 to 250
- 250 to 125

2. **Calculate the Division**:
Let's divide each number by the next number in the series:
- 4000 ÷ 2000 = 2
- 2000 ÷ 1000 = 2
- 1000 ÷ 500 = 2
- 500 ÷ 250 = 2
- 250 ÷ 125 = 2

We can see that each number is being divided by 2 to get the next number.

3. **Continue the Pattern**:
Now, we need to find the next number after 125 by dividing it by 2:
- 125 ÷ 2 = 62.5

4. **Conclusion**:
The next number in the series is 62.5.

### Final Answer:
The missing number in the series is **62.5**.

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