Here total number of digits = 6
The unit place can be filled with any one of the digits 2, 4, 6.
So number of permutation = 3P1 = 3!/2! = 3
Now the tens and hundred place can be filled by remaining 5 digits.
So number of permutation = 5P3 = 5!/3! = (5 x 4 x 3!)/3! = 20
Hence total number of permutations = 3 x 20 = 60