Quantitative Aptitude
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Permutation, Combination & Probability
Question
9 out of 20
There are seven candidate for 3 post in how many ways can the post be filled?
A  210 
B  120 
C  7^{3} 
D  3^{7} 
E  None of These

Ans. A
For first place there are 7 candidate while for second there are six candidate because one is selected in 1^{st} post same for 3^{rd} post rest are 5 candidate so total candidate be 7 x 6 x 5 = 210
Permutation, Combination & Probability Flashcard List
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