How to write a program to get probability that two cards same number and same color?

I need to write a program to get probability that both two cards are the same number(two cards are selected at random from an ordinary pack of 52 cards ) (1-1, 2-2, ..., 10-10) and the same color (Red-Red, Black-Black).with using a billon random events

Answer 1

[Iain]

If you're asking the question:

You take the Ace of spades from a standard 52 card deck, and you want to know the likelihood that you will then draw a black ace (the ace of clubs) from the remaining 51 cards, then the answer is 1 in 51.

Regardless of card, its 1 in 51.

 matches = 0;
 for i = 1:1e9
  if ceil(rand()*51) == 1 
   matches = matches + 1;
  end
 end
 measured_probability = matches / 1e9;