Quantitative Aptitude
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Permutation, Combination & Probability
Question
16 out of 20
Find the number of all even 2digit numbers, not having 0 at the unit’s place?
A  50 
B  21 
C  36 
D  48 
E  None of These

Ans. C
Even no. be 0, 2, 4, 6, 8 but if zero does not came on unit place then it can be filled as 2, 4, 6, 8 means 4 number. 1^{st} digit be filled as all number expect zero so total combination be 4 x 9 = 36
Permutation, Combination & Probability Flashcard List
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