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Guess/Check (1 Viewer)

HoldingOn

HoldingOn

Active Member
Joined
Dec 18, 2016
Messages
318
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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