What will come in place of question mark (?) in the given question?
15 21 32 48 69 ?

Options

A. 103
B. 100
C. 89
D. 95

Answer

To find the missing number in the series 15, 21, 32, 48, 69, ?, we will analyze the differences between the consecutive numbers.

### Step-by-Step Solution:

1. **Identify the series**: The series is 15, 21, 32, 48, 69, ?.

2. **Calculate the differences between consecutive terms**:
- Difference between 21 and 15:
\( 21 - 15 = 6 \)
- Difference between 32 and 21:
\( 32 - 21 = 11 \)
- Difference between 48 and 32:
\( 48 - 32 = 16 \)
- Difference between 69 and 48:
\( 69 - 48 = 21 \)

So, the differences are: 6, 11, 16, 21.

3. **Calculate the differences of the differences**:
- Difference between 11 and 6:
\( 11 - 6 = 5 \)
- Difference between 16 and 11:
\( 16 - 11 = 5 \)
- Difference between 21 and 16:
\( 21 - 16 = 5 \)

The second-level differences are all 5.

4. **Predict the next difference**:
Since the second-level difference is consistent at 5, we can predict the next difference in the first-level differences:
- Next difference = 21 + 5 = 26.

5. **Calculate the missing term**:
Now, we add this next difference to the last known term in the series:
- Missing term = 69 + 26 = 95.

Thus, the missing number in the series is **95**.

### Final Answer:
The value that comes in place of the question mark (?) is **95**.