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Quantitative Aptitude

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Permutation, Combination & Probability

Question
13 out of 20
 

How many 3-digits even number can be formed using 0,2,3,5,7 when Repetition are not allowed?



A 40
B 21
C 120
D 24
E None of These

Ans. B

For even number C’s place always be even digit so it be filled with 0, & 2

Now there are two conditions

Condition 1 when 2 be on unit place then onot come on A place so it be filled with rest 3, 5, 7 means 3 digit ( 0 & rest two between 3, 5, 7) so total number be 3 x 3 =9

Condition 2 when 0be on unit place then As be filled with 4 digit while Bs with rest 3 digit so total number formed is 4 x 3 = 12

So total = 12 + 9 = 21

Permutation, Combination & Probability Flashcard List

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