self Maths Puzzle

2,3,4
4,14,56
6,__,__

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self Other Question

If a person starts contributing certain amount(rs.) daily and adds Rs 2 more to its previous day's contribution. After 25 days, his total contribution is Rs. 675,With what amount he started on day one ? When you stop and look ,you can always see me.
If you try to touch you cannot feel me.
I cannot move ,but as you near me ,i will mlve away from you,..
What i'am????????