exam Maths Puzzle Numerical Ability

tan 11pi/6

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Suppose it will rain on any given day eith the probability of 0.34, independent of everything. What is the probability that of three consecutive days it will rain on the first two and not rain on the third? i have the problem 3/11b+5=5. From there have subtracted 5 from both sides and came up with B=3/11 From there i do not know what to do