Answer by
AdamSmith (14)
You start with 26 red cards, so the probability the 1st card is red is 26/52=1/2. Then the probability of being red is 25/51 for the 2nd card; 24/50(=12/25) for the 3rd card; 23/49 for the 4th card; and 22/48(=11/24) for the 5th card. So probability of all 5 cards red is:
1/2x(25/51)x(12/25)x(23/49)x(11/24)=253/9996, about 1 in 40.