CAT Quantitative Ability Questions | CAT Permutation, Combination and Probability questions
CAT/2003
Question . 29
There are 6 boxes numbered 1,2,.........6. Each box is to be filled up either with a red or a green ball in such a way that at least 1 boxcontains a green ball and the boxes containing green balls are consecutively numbered. The total number of ways in which thiscan be done is
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Explanatory Answer
Method of solving this CAT Quantitative Ability Question from Permutation, Combination and Probability question
(b) As the boxes containing the green balls areconsecutively numbered total number of ways will be6 + 5 + 4 + 3 + 2 + 1 = 21 ways