What will be come in place of the question mark (?) in the following number series
65 70 63 74 61 ?

Options

A. 78
B. 58
C. 72
D. 77

Answer

To solve the number series: 65, 70, 63, 74, 61, ?, we need to identify the pattern in the series.

### Step-by-Step Solution:

1. **Identify the two alternating sequences:**
- The first sequence consists of the numbers in the odd positions: 65, 63, 61.
- The second sequence consists of the numbers in the even positions: 70, 74, ?.

2. **Analyze the first sequence (odd positions):**
- Starting with 65, we see the following pattern:
- 65 to 63: 65 - 2 = 63
- 63 to 61: 63 - 2 = 61
- Continuing this pattern, the next number would be:
- 61 - 2 = 59.

3. **Analyze the second sequence (even positions):**
- Starting with 70, we see the following pattern:
- 70 to 74: 70 + 4 = 74
- Continuing this pattern, the next number would be:
- 74 + 4 = 78.

4. **Combine the results:**
- The first sequence gives us 59, and the second sequence gives us 78. However, since we are looking for the number that replaces the question mark (which is in the even position), we take the result from the second sequence.

5. **Conclusion:**
- Therefore, the number that will come in place of the question mark (?) is **78**.

### Final Answer:
The answer is **78**.