Find the number of ways of arranging six persons (having A, B, C and D among them) in a row sothat A, B, C and D are always in order ABCD (not necessarily together).

The number of ways of arranging seven persons (having A,B,C and D among them) in a row so that A,B,C and D are always in order A-B-C-D (not necessarily together) is (A) 24 (B) 5040 (C) 210 (D) 720

Find the number of ways in which four particular persons A,B,C,D and six more persons can stand in a queue so that A always stands before B,B before and C before D.

5 persons A, B, C, D and E are in a queue of a shop. The probability that A and E always occur together, is

There are 4 boys and 3 girls.Arrange the following in ascending order.a.Number of ways to arrange them in a row b.Number of ways to arrange them around a table c. Number of ways to arrange them in a row such that no two girls are together d.Number of ways to arrange them around a table such that all 3girls are together.

6 persons A,B,C,D,E,F are arranged in row. Find the conditional probability that C&D are separated given that A o* B are together.6

The total number of sitting arrangements of 7 persons in a row if 3 persons sit together in any order is

The total number of sitting arrangements of 7 persons in a row if 3 persons sit together in a particular order is