Let a>1 be a natural number and p denote a prime number then prove that the greatest common divisor of a-1 andis either i or p.

                                                                                                                                           -~ISI.

Somebody..

FOR HEAVEN'S SAKE PLEASE TRY!

isnt this an ISI entrance 2008 problem?

Yep..subjective part..you gave it?

no! one of my friends gave it and did almost all the subjectives and said this one was easy! Wait to see the solns here! He will put it up soon :)

http://iit-redefined.theforum.name/viewtopic.php?f=50&t=401

Sure!.your friend is madness or pardesi or both..whoever gave it..how was it seem?and what is likely to be a good score?

Guess what ..polls are coming soon...see mon nudge book

http://www.goiit.com/user/nudgebook/47658.htm.

Yes both madness and pardesi are my friends. pardesi is pardesi here in goiit too :D

contact pardesi there too or join that forum to ask doubts as he gave ISI not madness

Ya sure..just get there and register?

ofc :) you'll find other resources there too :) and ofc you have many olympiad students there :D

You and madness seem to have the same avatar ..extent of friendship huh?..k ..how did pardesi remember all the questions?

Excellent memory!

yes we are close friends :D

and pardesi solved almost all of them so he remembers :D

HAHA

oops i was supposed to stay away from here.

@conjurer:Why?