What will come in place of the question mark (?) in the given number series?
1 11 59 239 ? 1439

Options

A. 707
B. 729
C. 702
D. 719

Answer

To find the missing number in the series: 1, 11, 59, 239, ?, 1439, we can analyze the pattern in the series step by step.

### Step 1: Identify the pattern between the numbers
- The first number is **1**.
- The second number is **11**.
- The third number is **59**.
- The fourth number is **239**.

### Step 2: Calculate the operations between the numbers
1. From **1** to **11**:
- Multiply by **6**: \( 1 \times 6 = 6 \)
- Add **5**: \( 6 + 5 = 11 \)

2. From **11** to **59**:
- Multiply by **5**: \( 11 \times 5 = 55 \)
- Add **4**: \( 55 + 4 = 59 \)

3. From **59** to **239**:
- Multiply by **4**: \( 59 \times 4 = 236 \)
- Add **3**: \( 236 + 3 = 239 \)

### Step 3: Continue the pattern to find the missing number
4. From **239** to the missing number (?):
- Multiply by **3**: \( 239 \times 3 = 717 \)
- Add **2**: \( 717 + 2 = 719 \)

### Step 4: Verify the next number in the series
5. From the missing number (719) to **1439**:
- Multiply by **2**: \( 719 \times 2 = 1438 \)
- Add **1**: \( 1438 + 1 = 1439 \)

### Conclusion
The missing number in the series is **719**.