Find the missing number in the following series?
3, 5, 5, 19, 7, 41, 9, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
 DAF, FED, HIB, ? 

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
DP, EY, FJ, ?

Choose the related word/letters/number from the given alternatives.
 36 : 6 : : 441 : ?

Choose the related word/letters/number from the given alternatives.
 AF : BE : : ? : DH

Choose the related word/letters/number from the given alternatives.
 NPR : GHI : : TVX : ?

Choose the related word/letters/number from the given alternatives.
 Nest : Bird : : Den : ?

What will be the difference between the first digit of the highest number as well as of the lowest number after the positions of the first two digits in each number of the following series 738, 429, 156, 273, 894 are reversed?