it should be 7, and it is duplicate of
i don't know why you are confusing?
it is duplicate of https://gateoverflow.in/228305/ isn't it?
@Shaik Masthan....brother This is the comment before I saw your solution to that question...now I got that!
THEN SORRY !
it is recent question and you recently commented on this question... that's why i commented like that.
@Shaik Masthan sir...you are a true star,always ready for help!