What will come in place of question. Mark (?) in the following series questions?
3,8,18,33,53,?

Options

A. 72
B. 80
C. 76
D. 78

Answer

To solve the series: 3, 8, 18, 33, 53, ?, we will analyze the differences between consecutive terms to identify a pattern.

### Step-by-Step Solution:

1. **Identify the series**:
The series is: 3, 8, 18, 33, 53, ?

2. **Calculate the differences between consecutive terms**:
- Difference between 3 and 8:
\( 8 - 3 = 5 \)
- Difference between 8 and 18:
\( 18 - 8 = 10 \)
- Difference between 18 and 33:
\( 33 - 18 = 15 \)
- Difference between 33 and 53:
\( 53 - 33 = 20 \)

So, the differences are: 5, 10, 15, 20.

3. **Observe the pattern in the differences**:
The differences are increasing by 5 each time:
- 5 (1st difference)
- 10 (2nd difference)
- 15 (3rd difference)
- 20 (4th difference)

4. **Predict the next difference**:
Following the pattern, the next difference should be:
\( 20 + 5 = 25 \)

5. **Add the next difference to the last term in the series**:
Now, we will add this difference to the last term (53):
\( 53 + 25 = 78 \)

6. **Conclusion**:
Therefore, the number that will come in place of the question mark (?) is **78**.

### Final Answer:
The answer is **78**.