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Quantitative Aptitude

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Permutation, Combination & Probability

Question
18 out of 20
 

How many 2-digit numbers are there with distinct digits?



A 90
B 91
C 80
D 81
E None of These

Ans. D

First no. be filled with 9 digit while 2nd with 9 digit = 9 x 9 = 81

Permutation, Combination & Probability Flashcard List

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