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tmua.me Extreme Set B Paper 1 · Q11

Paper 1Probability

Ten cards, six red and four blue, are shuffled uniformly at random into a row. It is given that no two blue cards are next to one another.

What is the probability that every red card is next to at least one blue card?

A121\dfrac1{21}
B335\dfrac3{35}
C27\dfrac27
D25\dfrac25
E1835\dfrac{18}{35}
F57\dfrac57

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