26 of them.
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26 red and 26 black which makes 56 :-)
There are two red suits, hearts and diamonds. Each suit has 13 cards. So there are 26 red cards, which is half of the deck.
The probability is (26/52)*(25/51)*(26/50) = 16900/132600 = 0.1275 (approx).
The answer depends on how many blocks are chosen!
There are 1680 ways of arranging them is a straight line: fewer if in a circle.