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How many distinct arrangements can be made using the letters of (ALGEBRA) if the two (A)'s are together?

Answer and explanation

Correct answer: (720)

The word has seven letters: A, A, L, G, E, B and R. The two A’s are identical, and the condition requires them to remain next to each other. Treat the pair AA as one single block. The objects to arrange are then the block AA together with L, G, E, B and R, making six distinct objects in all.

These six objects can be arranged in \(6!\) ways because every object is different from the others. The block itself has no internal order to multiply by, since both letters inside it are identical A’s; changing one A with the other makes no new arrangement. Thus the number is \(6!=720\). Therefore option D is correct. A factor of 2 would be needed only if the two letters inside the block were different.

Related tags

LettersRepetitionBlock-Method

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