ABCDEF are standing in a column formation order. F is two places ahead of C. D is just ahead of A,
C is ahead of E. B is two places ahead of E but is not ahead of A. Who is the leader of the column?
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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.
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