A series is given with one term missing. Choose the correct alternative from the given ones:
निम्नलिखित प्रत्येक प्रश्न में एक अनुक्रम दिया है, जिसमें एक पद लुप्त है। दिये गये विकल्पों में से सही विकल्प चुनिये जो अनुक्रम को पूरा करे :
60, 121,243,?

Options

A. 480
B. 487
C. 484
D. 486

Explanation

To find the missing term in the series 60, 121, 243, we will analyze the differences between the consecutive terms and identify a pattern.

### Step-by-Step Solution:

1. **Identify the First Difference:**
- Calculate the difference between the first two terms:
\[ 121 - 60 = 61 \]

2. **Identify the Second Difference:**
- Calculate the difference between the second and third terms:
\[ 243 - 121 = 122 \]

3. **Observe the Pattern in Differences:**
- The first difference is 61 and the second difference is 122.
- Notice that the second difference (122) is double the first difference (61):
\[ 122 = 2 \times 61 \]

4. **Calculate the Next Difference:**
- Following the observed pattern, the next difference should be double the second difference:
\[ \text{Next difference} = 2 \times 122 = 244 \]

5. **Find the Missing Term:**
- Add the next difference (244) to the last known term (243):
\[ 243 + 244 = 487 \]

Thus, the missing term in the series is **487**.