How many three digits number can be formed by using the digits 4,5,6,7,8,9 if the repetition of digits allowed? Pick: A) 106 B) 108. C) 109 D) 110 E) 320
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 allowed, each of the tens and hundreds place can filled in 6ways. Hence required number of numbers = 3x6x6=108. Answer : 108.
<result>B</result>
How many three digits number can be formed by using the digits 4,5,6,7,8,9 if the repetition of digits allowed?