A number series is given below with one number missing, shown by a "?". Choose from the options the correct alternative that will fit the pattern of the series.2, 6, 12, ?, 30, 42, 56

A number series is given below with one number missing, shown by a "?"

1.	A number series is given below with one number missing, shown by a "?". Choose from the options the correct alternative that will fit the pattern of the series.2, 6, 12, ?, 30, 42, 56
A.	20
B.	21
C.	23
D.	28
Answer» B. 21