9 when divided by 10;

8 when divided by 9;

7 when divided by 8;

6 when divided by 7;

5 when divided by 6;

4 when divided by 5;

3 when divided by 4;

2 when divided by 3;

1 when divided by 2 ?

[ In other words: Find the Least number which when divided by 'N' leaves a remainder '(N-1)', for N = 1,2,3,4,........,9,10].