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(i)

Number of ways ways

(ii)

Number of ways ways

(iii)

Number of ways ways

(iv)

Case 1: 2 A’s together and B’s separated

Case 2: 2 B’s together and A’s separated

Case 3: 2 A’s together and 2 B’s together

720

Number of ways =10080 – 1800 – 1800 – 720 = 5760 ways

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