Dear All
The confusion is no doubt because I did not supply the original wording
or the accompanying diagram which would have clarified it. I was only
recalling a newspaper article of 20 or more years ago. The point is that if
the large circle is fixed and the small circle is the one that rolls, it
does an extra revolution by travelling round the outside, while if it rolled
on the inside it roll in the reverse direction and would be one fewer. The
comment was not so much that there was no correct answer allowed, but that
only one student in 100,000 realised this.
Gavin Ross
----- Original Message -----
From: "Paul Bivand" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, June 16, 2011 2:32 PM
Subject: Re: Oh those exam questions!
> Is the 3cm circle 3cm circumference, diameter or radius? The question
> seems undefined.
>
> Shouldn't proving the question impossible to answer rate for a first?
>
>
>
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