Permutations and Combinations
How many -digit even numbers can be formed from the digits if the digits can be repeated?
Solution: A three digit even number is to be formed from given digits .
Since, for the number is to be even , so ones place can be filled by
. So, there are
ways to fill ones place.
Since, repetition is allowed , so tens place can also be filled by ways.
Similarly,hundreds place can also be filled by ways.
So, number of ways in which three digit even numbers can be formed from the given digits is