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Question
Write in terms of factorial:
5 × 10 × 15 × 20 × 25
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Solution
5 × 10 × 15 × 20 × 25
= (5 × 1) × (5 × 2) × (5 × 3) × (5 × 4) × (5 × 5)
= (55) (5 × 4 × 3 × 2 × 1)
= (55) (5!)
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