Question

A,B,C,D,Eand F are 6 students. They are to be seated on 6 chairs in a row. Find the probability that

A and B are sitting together
A and B are not sitting together
D,E and F are sitting together
A and F are sitting at the ends of row
​

Answer 1

Answer:

18

Step-by-step explanation:

Say B on right side of A

D or C will be right of B

This can be done in 2! ways. Remaining three places can be filled in 3! ways

=2!×3!=12 ways.

Say C on right of A

B can be filled in 3 places. (B next should be D).

B immediately next is D

′ A ′ , ′ C ′ , ′ B ′ , ′D ′

are filled in 3 ways. Remaining two places in 2 ways.

Total =6 ways

Total number =12+6=18 ways.

Answer 2

Answer:

124 the answers of the questions