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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  is


Question ID - 153648 | Toppr 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

1 Answer - 5876 Votes

3537

Answer Key : (5) -

(5)

A AAAA  B BBBBB

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( place) and then their image about M in a unique way

Number of ways N



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