Q. The integers from 1 to 9 inclusive are written on 9 cards, which are shuffled. 3 cards are then drawn at random. Find theThe mark scheme tells me this:probabilitythat the numbers on these cards areconsecutive?

1-No of ways of drawing 3 cards= (9x8x7)/6=84

2-No of consecutive triads = 7, so P (consecutive)= 1/12

I understand most of this, but am not sure why you divide by 6 in step one.

Help would be greatly appreciated!