Insert the missing number: 14, 9, 5, 21, 8, 13, 28, 9, _____?
- 18
- 19
- 14
- None of these
Explanation
The pattern of the sequence appears to be a alternating addition and subtraction of numbers:
14 - 5 = 9
9 - 4 = 5
5 + 16 = 21
21 - 13 = 8
8 + 5 = 13
13 + 15 = 28
28 - 19 = 9
So, the next number in the sequence would be:
9 + 10 = 19
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- None of these
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- None of these
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