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Look at the series : 3, 7, 24, 11, __, 19, 19,... What number should fill the blank ?

Correct Answer: 15

Explanation:

Two series alternate here, with every third number following a different pattern.
In the main series, 4 is added to each number to arrive the next.
In alternate series, 5 is subtracted from each number t arrive the next number.
Here in the main series
3 + 4 = 7
7 + 4 = 11
11 + 4 = 15
15 + 4 = 19


In alternate series
24 - 5 = 19
19 - 5 = 14...


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