Question
If two pencils are picked at random, what is the
probability that either both are green or both are yellow? Â A box contains 6 red, 4 blue, 2 green and 4 yellow pencils.ÂSolution
Total number of pencils = 6 + 4 + 2 + 4 = 16 Let S be the sample space. Then, n(S) = number of ways of drawing 2 pencils out of 16 = 16C2 = (16x15)/(2x1)  = 120 Let E= event of drawing 2 pencils so that that either both are green or both are yellow = n(E) = 2C2 + 4C2 = 1+6 =7  P (E) = 
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