supposed 2 cards are drawn from a deck of 52 cards. whats the probablity that both are spades

Like Gamalon said, first you have 52 cards and 13 of the spades so
13/52
For the second card you have only 12 spades left from 51 cards (because you took the first one) so 12/51
So...
13/52*12/51=0.059

It’s 13/52 for the first card and 12/51 for the second. Multiplying you get 12*13/(52*51) =.0588 probability of 5.88%

Another way to do this is to use combinations. The probability is C(13,2)/C(52,2)

= [13!/(2!11!)][52!/(2!50!] = [13*12/2][52*51/2] = 13*12/(52* 51) = .059

Logically it's 25% but "chance" reeks havoc with this theory.

Think of a number between 1 and 50 odd digits.

fair if its not shuffled.

One in 2700