In each of the following questions, find the wrong term in the given series.
2,3,5,7,11,15,17

Options

A. 3
B. 11
C. 15
D. 17

Answer

To find the wrong term in the series 2, 3, 5, 7, 11, 15, 17, we can follow these steps:

### Step 1: Identify the Series
The given series is:
\[ 2, 3, 5, 7, 11, 15, 17 \]

### Step 2: Look for Patterns
We need to determine if there is a recognizable pattern in the series. Observing the numbers, we notice that most of them are prime numbers.

### Step 3: List the Prime Numbers
The prime numbers are:
- 2
- 3
- 5
- 7
- 11
- 13 (next prime after 11)
- 17

### Step 4: Compare the Series with Prime Numbers
Now, let's compare the series with the list of prime numbers:
- 2 (prime)
- 3 (prime)
- 5 (prime)
- 7 (prime)
- 11 (prime)
- **15 (not prime)**
- 17 (prime)

### Step 5: Identify the Wrong Term
From our comparison, we can see that 15 is not a prime number. The prime number that should be in its place is 13.

### Conclusion
Thus, the wrong term in the series is:
\[ \text{15} \]