Between 3 and 18, with 4 middle numbers, what is the 3rd middle number?
- 9
- 12
- 15
- 18
Explanation
This looks like an arithmetic sequence problem.
If the first term and last term , and there are 4 numbers in between, the total terms (3 + 4 + 18).
The terms:
Number of terms
Common difference
The 3rd middle number is the 4th term:
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