Q.The number of 5-letter words (not necessarily meaningful) using letters from {A,B,C,D,E} such that A and E never come together is

3125 - 1200

5^5 - 2 × 4^5

5^5 - 2 × 5 × 4^4

5^5 - 2 × 4^5 + 4^5

The correct solution involves applying the fundamental concept to derive the final value step by step...

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