There are five different roads connecting Agra and Delhi. In how many ways a person can
complete his journey if he goes from Agra to Delhi by one road and returns by another
road ?
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let the five roads as A B C D and E
Now ways are :-
ONE ROAD ANOTHER ROAD
A B
A C
A D
A E
B A
B C
B D
B E
C A
C B
C D
C E
D A
D B
D C
D E
E A
E B
E C
E D
THEREFORE,
20 ways to travel
Now ways are :-
ONE ROAD ANOTHER ROAD
A B
A C
A D
A E
B A
B C
B D
B E
C A
C B
C D
C E
D A
D B
D C
D E
E A
E B
E C
E D
THEREFORE,
20 ways to travel
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