Quantitative Aptitude
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Permutation, Combination & Probability
Question
11 out of 20
How many 3digits number can be formed using 0,1,3,5,7 when Repetition are not allowed?
A  64 
B  4^{3} 
C  3^{4} 
D  48 
E  None of These

Ans. D
When repetation not allowed we can fill first digit with (1, 3, 5, 7) means 4 digit while 2^{nd} digit be fill with rest 4 digit while third digit be filled as rest 3 digit means total 4 x 4 x 3 = 48
Permutation, Combination & Probability Flashcard List
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