Question
Integers 11, 12, 13, 14 are written on 4 cards they are well shuffled. Two cards are taken at random without replacement. What is the probability that the sum is at least 25?
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Out of these 12 combinations, four are having the sums at least 25. Probability of picking two cards, whose sum is at least 25 will thus be 8/12 = 2/3