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Guess/Check (1 Viewer)

HoldingOn

Active Member
Joined
Dec 18, 2016
Messages
323
Location
The Cosmos
Gender
Male
HSC
2018
Is it ever acceptable to use guess and check? Say for a problem like c iii from the 2004 HSC:

http://prntscr.com/kx0cli

Rather than using the definition of nCr can we just set up the inequality and substitute values in?
 

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