Select the number that can replace the question mark (?) in the following series. 18, 31, 44, 57, 70, ?
Identifying the Number Series Pattern
The given series is 18, 31, 44, 57, 70, ?
To find the missing number, let's examine the difference between consecutive terms:
- Difference between the second and first term: $31 - 18 = 13$
- Difference between the third and second term: $44 - 31 = 13$
- Difference between the fourth and third term: $57 - 44 = 13$
- Difference between the fifth and fourth term: $70 - 57 = 13$
The pattern observed is a constant difference of 13 between each consecutive number in the series. This indicates an arithmetic progression.
Calculating the Missing Number
To find the number that replaces the question mark (?), we add the common difference (13) to the last known term (70).
Calculation: $70 + 13 = 83$
Therefore, the number that should replace the question mark is 83.
This matches Option 1.
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