Find the wrong number in the following number series.
`18," "20," "43," "133," "537," "2691," "16163`

Options

A. A)43
B. B)16163
C. C)133
D. D)537

Answer

To find the wrong number in the given series: `18, 20, 43, 133, 537, 2691, 16163`, we will analyze the pattern in the series step by step.

### Step 1: Identify the Pattern
We will look for a pattern in the series by examining how each term relates to the previous term.

1. **First Term (18)**:
- Multiply by 1 and add 2:
\[ 18 \times 1 + 2 = 20 \]

2. **Second Term (20)**:
- Multiply by 2 and add 3:
\[ 20 \times 2 + 3 = 43 \]

3. **Third Term (43)**:
- Multiply by 3 and add 4:
\[ 43 \times 3 + 4 = 133 \]

4. **Fourth Term (133)**:
- Multiply by 4 and add 5:
\[ 133 \times 4 + 5 = 537 \]

5. **Fifth Term (537)**:
- Multiply by 5 and add 6:
\[ 537 \times 5 + 6 = 2691 \]

6. **Sixth Term (2691)**:
- Multiply by 6 and add 7:
\[ 2691 \times 6 + 7 = 16153 \]

### Step 2: Compare with the Given Last Term
The last term calculated using the identified pattern is **16153**, but the series gives **16163** as the last term.

### Step 3: Conclusion
Since the calculated last term (16153) does not match the given last term (16163), we conclude that **16163** is the wrong term in the series.

### Final Answer
Thus, the wrong number in the series is **16163**.

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