Find the missing numbers.
3, 9, 27, 81, ...

Options

A. 243
B. 324
C. 342
D. 432

Answer

To find the missing number in the series 3, 9, 27, 81, we can follow these steps:

1. **Identify the pattern**: Look at how each number relates to the previous one.
- The first number is 3.
- The second number is 9, which is \(3 \times 3\).
- The third number is 27, which is \(9 \times 3\) or \(3 \times 3 \times 3\).
- The fourth number is 81, which is \(27 \times 3\) or \(3 \times 3 \times 3 \times 3\).

2. **Establish the multiplication rule**: From the observations, we can see that each number is obtained by multiplying the previous number by 3.

3. **Calculate the next number**: To find the next number in the series, we take the last number (81) and multiply it by 3.
\[ 81 \times 3 = 243 \]

4. **Conclusion**: Therefore, the missing number in the series is 243.

### Summary of Steps:
- Identify the multiplication pattern in the series.
- Multiply the last number by 3 to find the next number.