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Question
Write in terms of factorial.
5 × 10 × 15 × 20
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Solution
5 × 10 × 15 × 20 = (5 × 1) × (5 × 2) × (5 × 3) × (5 × 4)
= (54) (4 × 3 × 2 × 1)
= (54) (4!)
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