35, 63, 105, 121, 133, 210

Options

A. 35
B. 63
C. 105
D. 121

Explanation

To solve the problem of identifying the wrong number in the series: 35, 63, 105, 121, 133, 210, we can follow these steps:

### Step 1: Identify the pattern
First, we need to examine the series to see if there is a common pattern or relationship among the numbers.

### Step 2: Divide each number by 7
To check if the numbers are multiples of 7, we can divide each number by 7:
- 35 ÷ 7 = 5
- 63 ÷ 7 = 9
- 105 ÷ 7 = 15
- 121 ÷ 7 = 17.2857 (not a whole number)
- 133 ÷ 7 = 19
- 210 ÷ 7 = 30

### Step 3: Analyze the results
From the results of the division:
- 35, 63, 105, 133, and 210 yield whole numbers (5, 9, 15, 19, and 30 respectively).
- However, 121 does not yield a whole number (it gives approximately 17.2857).

### Step 4: Identify the incorrect number
Since 121 is the only number that does not result in a whole number when divided by 7, it is identified as the incorrect number in the series.

### Step 5: Conclusion
Thus, the wrong number in the series is **121**.

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