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x implies y

I no yes yes yes
II turn over '5'

?

Cheradenine Zakalwe
Thursday, June 06, 2002

The answer to the first question is that the black circle is also frobby, the other shapes are not frobby.

For the white triangle to be forbby the interviewer must be thinking either:
a) white circle; or
b) black triangle

In case a), the frobby items are white triangle and black circle (while white circle is non-frobby, has both attributes and black triangle is non-frobby has neither attribute).  The same is true for case b) (vice-versa on the reasons though).

The answer to the second question is 2 cards must be turned over:  the one with the 5 on it (to prove it has a vowel on the back) and the one with the F (if the F has an odd number on the back then it would disprove the rule).  The other two cards don't matter.

David Wiltshire
Monday, June 24, 2002

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