Number of ways in which 5 A’s and 6 B’s can be arranged in a row which reads the same backwards and forwards, is N then value of 
is
Number of ways in which 5 A’s and 6 B’s can be arranged in a row which reads the same backwards and forwards, is N then value of is
Question ID - 153648 | SaraNextGen Top Answer
Number of ways in which 5 A’s and 6 B’s can be arranged in a row which reads the same backwards and forwards, is N then value of is
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Number of ways in which 5 A’s and 6 B’s can be arranged in a row which reads the same backwards and forwards, is N then value of |
1 Answer
127 votes
Answer Key / Explanation : (5) -
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(5) A AAAA Since word reads the same backwards and forwards, the middle digit must beA M
So that even number of A’s and B’s are available for arrangement about middle position M in the above figure Take AABBB on one side of M(
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B BBBBB
place) and then their image about M in a unique way
Number of ways N
127 votes
Answer Link
127