1. The problem statement, all variables and given/known data From 52 cards we draw one .Whats the probability that the drawn card is divisible by 4 Now : in my notebook its 12/52=3/13 .But shouldn't it be 13/52 ? BECAUSE clearly if we multiply 13 *4=52 Same problem : Whats the probability that of 52 cards I draw one that is divisible with 10 or 11 .In notebook its like this P(a)+p(b)= 4/52+4/52=8/52=4/26=2/13 BUT shouldn't this as well be 5/52+5/52 2. Relevant equations 3. The attempt at a solution PLEASE just tell the correct answer every time I post here somebody argues about pointless stuff and leaves me hanging with no clue !!?!? Sorry second problem fixed so 4/52+5/52 is correct ?