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Write in terms of factorial:

6 × 7 × 8 × 9

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#### Solution

6 × 7 × 8 × 9 = 9 × 8 × 7 × 6

Multiplying and dividing by 5!, we get

= `(9xx8xx7xx6xx5!)/(5!)`

= `(9xx8xx7xx6xx5xx4xx3xx2xx1)/(5!)`

= `(9!)/(5!)`

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