In the Following questions pick the odd thing out.
The following questions follow a definite pattern. Observe the same and fill in the blanks with suitable answers.
9 , 28, 126, ........, 1332
P3C, RSF, T8I, V12L, ........
99, 80, 63, 48, ......, 24, 15
C, D, G, K, M, .........
1, 2, 6, 15, 31, ......., 92