(1) assuming that no 2 consecutive digit  are same , the no. of n digit no. is

ans=

n!

9

9ⁿ

n⁹

9^n

 In the first place excepting 0 all the 9 numbers can come ..in the next place excepting the number which appeared to its left (1st number) , other 9 numbers can come ...similarly all n places 9 numbers can come ..

Thus, the answer is 9*9*9*9....n times = 9ⁿ 

Cool !!

I was talking abt the editor

how come u placed a link on those guitars? :D :D :D

Ya ur right abt it ...The new editor is really nice

I didnt mean to

Now I think

In Safari, (the browser i use) mozilla n all. usin ctrl+c copies the smileys html code

whereas a rt clic n copy copies it as an image.

the former is why an auto html link is created while the latter is not useful