A small block slides down on a smooth inclined plane, starting from rest at time t = 0 . Let S n be the distance travelled by the block in the interval t = n - 1 to t = n . Then, the ratio S n S n+1 is

1. A. 2n-1 2n+1
2. B. 2n+1 2n-1
3. C. 2n 2n-1
4. D. 2n-1 2n

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