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Question

Find the number that fits somewhere into the middle of the series. Some of the items involve both numbers and letters

Look at this series: 15, __, 27, 27, 39, 39, ... What number should fill the blank?

Options:
A .  51
B .  39
C .  23
D .  15
Answer: Option D
In this simple addition with repetition series, each number in the series repeats itself, and then increases by 12 to arrive at the next number.

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