What should come in place of question mark in questions
25 35 49 67 89 ?

Options

A. 24
B. 81
C. 115
D. 107

Answer

To solve the problem of finding the missing number in the series: 25, 35, 49, 67, 89, ?, we can follow these steps:

### Step 1: Identify the differences between consecutive numbers
- Calculate the difference between each pair of consecutive numbers:
- 35 - 25 = 10
- 49 - 35 = 14
- 67 - 49 = 18
- 89 - 67 = 22

### Step 2: List the differences
- The differences we found are:
- 10, 14, 18, 22

### Step 3: Analyze the pattern in the differences
- Now, observe the differences:
- The difference between each consecutive difference:
- 14 - 10 = 4
- 18 - 14 = 4
- 22 - 18 = 4
- This shows that the differences are increasing by 4 each time.

### Step 4: Determine the next difference
- Since the last difference we calculated is 22, we add 4 to find the next difference:
- 22 + 4 = 26

### Step 5: Calculate the next number in the series
- Now, we add this new difference (26) to the last number in the series (89):
- 89 + 26 = 115

### Conclusion
- Therefore, the number that should come in place of the question mark is **115**.