Complete the series: 21, 20, 18, 15, 11, ______?
- 26
- 17
- 8
- 6
Explanation
Step 1: Identify the pattern
Find the differences between consecutive terms:
- 21 - 20 = 1
- 20 - 18 = 2
- 18 - 15 = 3
- 15 - 11 = 4
The pattern of differences is: +1, +2, +3, +4
Step 2: Find the next difference
- The next difference should be +5
- 11 - 5 = 6
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