Among the 4 -digit numbers that can be formed using the digits $1,2,3,4,5$ and 6 without repeating any digit, the number of numbers which are divisible by 6 is

If the number of circular permutations of 9 distinct things taken 5 at a time is $n_1$ and the number of linear permutation of 8 distinct things taken 4 at a time is $n_2$, then $\frac{n_1}{n_2}=$

The number of ways in which 4 different things can be distributed to 6 persons so that no person gets all the things is

The sum of all the 4 -digit numbers formed by taking all the digits from $2,3,5,7$ without repetition, is