Practise maths exams questions & Answers online
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A bag contains 5 black, 4 white and x red marbles. If the probability of picking a red marble is 2/5 , find the value of x.
Find the variance of 2x, 2x -1 and 2x + 1.
For what value of n is n +1C3 = 4(nC3)?
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