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s12-62
Part v
Ok so solving it using the combination probability formula works
but then i did it this way and the answer is wrong... pls tell why it can't work this way??
P(wrapped in gold foil) = 12/30 = 0.4
therefore , P(success) = 0.4 and P(failure) = 0.6
P(exactly 2 wrapped) = 4C2*0.4^2*0.6^2
= 0.346
But the answer is 0.368 which I know how to get using the combination probability but then why is this method using the binomial wrong??