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Quantitative Aptitude

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Permutation, Combination & Probability

Question
17 out of 20
 

How many 3-digit numbers are there with no digit repeated?



A 720
B 648
C 256
D 580
E None of These

Ans. B

A will be filled as All 9 digit expect Zero

B will be filled as zero and rest eight digit means 9 digit C will be filled as eight digit expect two digit which filled in A and B. so total number be 9 x 9 x 8 = 648

Permutation, Combination & Probability Flashcard List

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