i would like to mention something about this number.this number is known as revolving numbers.

142857*2=285714

142857*3=428571

142857*4=571428

142857*5=714285

142857*6=857142

142857*7=999999

1/7=0.142857142857.......

2/7=0.428571428571.......

3/7=0.571428571428.......

and so on.

this identical question was also there in fiitjee open test fot iit jee 2008