[Miguel]

Yes, using random(value):

pawn Code:

random(5); // this will return a number from 0 to 4

Example:

pawn Code:

public OnPlayerCommandText(playerid, cmdtext[])
{
  new
    rand = random(10);

  if(strval(cmdtext) == rand)
  {
    SendClientMessage(playerid, COLOR, "You got it!");
    GivePlayerCash(playerid, 1000000);
    return 0;
  } 
  return 1;
}