Q. 55.0( 2 Votes )

Write the number

Answer :

As, it is required that two N’s come together, so, let us consider {NN} as a single object.


Thus we have, 5 objects {B}, {A}, {NN}, {A}, {A}, and there are 3 A's.


So, the number of arrangements in which the two N's are together is



= 20


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