Permutation Tes...

If no husband and wife play in the same game, then the number of ways in which a mixed double game can be arranged from among nine married couples is

In how many ways can 3 girls and 9 boys be seated in two vans, each having numbered seats with 3 in the front and 4 in the back, if 3 girls sit together in the back row on adjacent seats?

The number of ways in which we can arrange the digits 1, 2, 3, …, 9, such that the product of five digits at any of the five consecutive positions is divisible by 7, is

An eight-digit number divisible by 9 is to be formed by using 8 digits out of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 without replacement. The number of ways in which this can be done is