Insert the missing number. 12, 25, 49, 99, 197, 395, (...)	Options:
A) 789  B) 722  C) 812  D) 779  E) 1579
Each number is twice the previous one with 1 added or subtracted alternatively.   789nswer is 789.
<result>A</result>
Insert the missing number. 12, 25, 49, 99, 197, 395, (...)