How many three digits number can be formed by using the digits 4,5,6,7,8,9 if the repetition of digits not allowed?	Choose the correct choice from the following choices
A) 80 B) 70 C) 60 D) 40 E) 30
For a number to be odd we must have 5,7 or 9 at the unit place. So there 3 ways of filling the unit place. Since the repetion of digits is not allowed, the tenths place can be filled with any of the remaining 5 digits in 5 ways. Now hundreds place can be filled in 4 ways by the remaining 4 numbers. So the required number of numbers is 3x5x4 =60 Answer : 60
<result>C</result>
How many three digits number can be formed by using the digits 4,5,6,7,8,9 if the repetition of digits not allowed?