Which of the following groups of alphabets should replace the blank spaces so that the group of alphabets, given in bold, follow a logical pattern from the preceding and the following group of alphabets?
b w_ y z a   d s t u v _   _o p q r e

If two is subtracted from each odd digit and three is added to each even digit in the number 3675249 how many digits will appear twice in the new number thus formed?

Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it.
c_bba_cab_ac_ab_ac