aptitude que.....

I will be   DAILY POSTING A APTITUDE QUESTION IN DIFFRENT STREAMS AND IF U CAN SOLVE THAT ,U  CAN ANSWER THE QUESTION AS YOUR COMMENT..,IF NOT THE NEXT DAY I'LL ANSWER THE QUESTION AS A COMMENT ..SO THAT U CAN IMPROVE YOUR APTITUDE SKILL..:)

2 . 3 . 4 . 15 . 12 3 . 4 . 5 . 28 . 20 4 . 5 . 6 . 45 . 30 5 . 6 . 7 . 66 . 42 6 . 7 . 8 . ?? . 56