The numbers 1,2,3,.., n are arranged in a random order. The probability that the digits `1,2,3,..,k(n gt k)` appears as neighbours in that order is

The numbers 1,2,3,…n are arranged in a random order. The probability that the digits 1,2,3,…..,k( k lt n ) appear as neighbours in that order is

The numbers 1,2,3,...,n are arrange in a random order.The probability that the digits 1,2,3,...,k(k

The numbers 1, 2, 3, ..., n are arrange in a random order. The probability that the digits 1, 2, 3, .., k( k < n) appear as neighbours in that order is

The numbers 1, 2, 3, ..., n are arrange in a random order. The probability that the digits 1, 2, 3, .., k( k < n) appear as neighbours in that order is

The numbers 1,2,3,..n are arranged in a random order. The probability that the digits 1,2,3,….k (k lt n) appear as neighbours is

The numbers 1, 2, 3, ..., n are arrange in a random order. The probability that the digits 1, 2, 3, .., k( k < n) appear as neighbours in that order is (a) 1 n ! (b) k ! / n! (c) (n-k)! / n! (d) (n-k+1)! / n!

If the numbers 1,2,3….,n are arranged in a line at random what is the probability that the numbers 1 and 2 will appear next to each other?

The digits 1,2,3,.....9 are written in random order to form a nine digit number.Find the probability that this number is divisible by 11 .