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It's a question on the application for my it certification school

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1 Answer 1

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The obvious answer is

26

Explanation:

The gap between the numbers starts at 3 and gets larger each time.

1 + 3 = 4
4 + 4 = 8
8 + 5 = 13
13 + 6 = 19
19 + 7 = 26

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