Complete the number series: 9, 10, 13, 19, ______?
- 21
- 23
- 25
- 28
Explanation
The pattern in the series is as follows:
9 + 1 = 10
10 + 3 = 13
13 + 6 = 19
The next difference should be +9:
19 + 9 = 28
So, the correct answer is 28.
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