Which of the following numbers will replace the question mark (?) in the given series?
12, 14, 31, 97, 393, ?
A1970
B1972
C1971
D1965
A1970
B1972
C1971
D1965
Related Questions:
In the given number series, how many 4s are preceded by 7 but not followed by 8?
3 4 5 1 4 3 1 4 8 5 4 3 3 4 9 8 4 1 2 3 4 1 3 6