Number of permutations of 1, 2, 3, 4, 5, 6, 7, 8, and 9 taken all at a time are such that the digit 1 appearing somewhere to the left of 2 3 appearing to the left of 4 and 5 somewhere to the left of 6, is `kxx7!` Then the value of `k` is _________.

Number of permutations of 1,2,3,4,5,6,7,8 , and 9 taken all at a time are such that digit 1 appearing somewhere to the left of 2 and digit 3 appearing to the left of 4 and digit 5 somewhere to the left of 6 , is (e.g. 815723946 would be one such permutation)

Number of permutations of 1,2,3,4,5,6,7,8 and 9 taken all at a time,such that the digit I appearing 3 appearing to the left of 4 and 5 somewhere to the left of 6, is

How many three-digit number can be generated from 1, 2, 3, 4, 5, 6, 7, 8, 9, such that the digits are in ascending order?

Number of 6 -digit telephone numbers, whichcan be constructed with digits 0,1,2,3,4,5,6,7,8,9, if each number starts with 35 and nodigit appears more than once is

Let N be the number of 6-digit numbers such that the digits of each number are all form the set {1, 2, 3, 4, 5} and any digit that appears in the number appears atleast twice. Then the last digit of N is: