Quantitative Aptitude
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Permutation, Combination & Probability
Question
13 out of 20
How many 3digits 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 “o”not 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 “0”be on unit place then A’s be filled with 4 digit while B’s 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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