You are guaranteed to win one of the following five prizes, the letter says. (And it is completely free! Just 6 dollars shipping and handling.)
a) a high-definition huge-screen TV,
b) a video camera,
c) a yacht,
d) a decorative ring, and
e) a car.
Oh yeah, you think, a worthless decorative ring, and throw the letter away.
But once I got a letter with the following promise:
You are guaranteed to win two of the following five prizes, the letter said.
a) a high-definition huge-screen TV,
b) a video camera,
c) a yacht,
d) a decorative ring, and
e) a car.
Now, one prize will be a worthless decorative ring, but what will the second prize be?
Combinatorics and more 
two decorative rings, clearly
I agree, they never said two distinct prizes.
(The real question is, are the decorative rings Cohen-Macaulay?)
(GK:!!!)
I agree with highschool, but it could be the yacht: you can’t give those things away! The docking fees alone cost as much as a car a year. (A friend of mine recently accepted the offer of a free yacht. Not such a good deal for him in the end 😉 )
A matchbox car.
The video camera. A low res webcam without power supply or recording media could be made extremely cheaply.
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