What should come in place of question mark in questions
11 9 15 41 159 ?

Options

A. 740
B. 607
C. 751
D. 789

Answer

To solve the sequence: 11, 9, 15, 41, 159, ?, we need to identify the pattern in the numbers.

### Step-by-Step Solution:

1. **Identify the Pattern**:
- Start with the first number, 11.
- The second number is 9. Notice that 9 is derived from 11 by multiplying by 2 and then subtracting 3:
\[ 11 \times 2 - 3 = 22 - 3 = 19 \quad (\text{Incorrect, let's check again}) \]
Actually, it should be:
\[ 11 - 2 = 9 \]

2. **Continue the Pattern**:
- Now, let's check how we get from 9 to 15:
\[ 9 \times 2 - 3 = 18 - 3 = 15 \]
- Next, from 15 to 41:
\[ 15 \times 3 - 4 = 45 - 4 = 41 \]
- From 41 to 159:
\[ 41 \times 4 - 5 = 164 - 5 = 159 \]

3. **Establish the Next Step**:
- Now, we need to find the next number after 159. Following the established pattern:
- We multiply by 5 and then subtract 6:
\[ 159 \times 5 - 6 \]
- Calculate \( 159 \times 5 \):
\[ 159 \times 5 = 795 \]
- Now subtract 6:
\[ 795 - 6 = 789 \]

4. **Conclusion**:
- The number that should come in place of the question mark is **789**.

### Final Answer:
The answer is **789**.