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Answer : 4 15 × 13 × 13! Explanation : Answer: D) 15 × 13 × 13! Explanation: 15! - 14! - 13!= (15 × 14 × 13!) - (14 × 13!) - (13!)= 13! (15 × 14 - 14 - 1)= 13! (15 × 14 - 15)= 13! x 15 (14 - 1)= 15 × 13 × 13!

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