Latest Wipro Aptitude Question SOLUTION: If all of the phone extensions in a certain organisation must be even numbers, and if each of the extensions uses all four of the digits 1, 2, 3, and 6, what is the greatest number

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If all of the phone extensions in a certain organisation must be even numbers, and if each of the extensions uses all four of the digits 1, 2, 3, and 6, what is the greatest number of four-digit extensions that the organisation can have?
A. 4
B. 6
C. 12
D. 16
E. 24

Asked In Wipro (12 years ago)

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abhinav kumar  (4 years ago)

The four digits available are 1,2,3 and 6
as the extensions can only be even numbers, the last digit has to be either 2 or 6
If it is 2...it leaves 1,3 and 6 for the first three digits...these can be arranged in 3! ways
If the last digit is 6...it leaves 1,2 and 3 for the first three digits...these can be arranged in 3! ways

Thus answer is 2*3! = 12

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RANGASWAMY  (4 years ago)

the answer is 4

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