CAT Quantitative Ability Questions | CAT Permutation, Combination and Probability questions
CAT/2000
Question . 49
One red, three white and two blue flags are to be arranged in such a way that no two flags of the same colour are adjacent and theflags at the two ends are of different colours. The number of ways in which this can be done is
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Explanatory Answer
Method of solving this CAT Quantitative Ability Question from Permutation, Combination and Probability question
(a) There are three white flags and ends having differentcolours, the only possibility at the ends are red andwhite or white and blue.
W___W___W___ the empty spaces can be filled in 3ways by one red and two blue flags.
___W___W___W again the empty spaces can be filledin 3 ways so, the total number of ways will be 6.