Select the option that will fill in the blank and complete the series.
6, 44, 9, 42, __, 40

Given: 6, 44, 9, 42, __, 40

Logic: 1st series: 6, 9,12..

2nd series: 44, 42, 40...

44 - 2 = 42; 42 - 2 = 40

6 + 3 = 9

Similarly, 9 + 3 = 12​

So, 12 is the missing number.

Thus, the correct answer is (c).