Select the option that represents the letters that, when placed from left to right in the following blanks, will complete the letter series.
S C R _ W S _ R _ W _ C _ G W S _ R H _

1,9,17,33,49,73 (…)

5, 16, 49, 104, ?

Find the missing number?

2, 3, 5, 6 ,? , 9, ?, 12

3, 6, 5, 20, 7, 42, 9, (…)

1, 2, 3, 14, 5, 34, 7, ?, ?

4, 10, 40, 190, 940, ? , 23440