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8!/(8-3)!=?

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by Max@Math Revolution » Mon May 23, 2016 7:53 pm
8!/(8-3)!=?
A. 336
B. 346
C. 356
D. 366
E. 396

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by Brent@GMATPrepNow » Tue May 24, 2016 7:26 am
Max@Math Revolution wrote:8!/(8-3)!=?
A. 336
B. 346
C. 356
D. 366
E. 396

*An answer will be posted in 2 days.
8!/(8-3)! = 8!/5!
= (8)(7)(6)(5)(4)(3)(2)(1)/(5)(4)(3)(2)(1)
= (8)(7)(6)
= 336
= A

RELATED RESOURCES (videos)
- Factorial notation : https://www.gmatprepnow.com/module/gmat ... /video/780
- Related practice question: : https://www.gmatprepnow.com/module/gmat ... /video/781

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by Max@Math Revolution » Wed May 25, 2016 5:24 pm
8!/(8-3)!=8!/5!=8*7*6=336. Hence, the correct answer is A.
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