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

Look at this series: 15, __, 27, 27, 39, 39, ... What number should fi

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