IN the following questions a number series is given in which one number is wrong. Find out the wrong number. Do not consider alternate series?
10 15 30 75 225 900 3150

Options

A. 30
B. 900
C. 75
D. 15

Answer

To find the wrong number in the given series: 10, 15, 30, 75, 225, 900, 3150, we will analyze the pattern of the series step by step.

### Step 1: Identify the pattern
Let's look at the first few numbers:
- Start with 10.
- Multiply by 1.5 to get 15.
- Multiply 15 by 2 to get 30.
- Multiply 30 by 2.5 to get 75.

### Step 2: Continue the pattern
Now, let's continue this pattern:
- Multiply 75 by 3 to get 225.
- Multiply 225 by 3.5 to get 787.5.

### Step 3: Check the next number
Next, we should multiply 787.5 by 4 to see what we get:
- 787.5 * 4 = 3150.

### Step 4: Compare with the series
Now, let's compare this with the original series:
- The series we have is: 10, 15, 30, 75, 225, 900, 3150.
- We found that after 225, the next number should be 787.5, but instead, we have 900.

### Conclusion
Thus, the wrong number in the series is **900**.