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Under Artificial Stupidity we have the text: "Note that sometimes contestants try to be clever by using all the numbers when the computer has only used two or three.."
What computer? The only computer is the random number generator which sets the target, it doesn't do the working out/checking the contestant's answers, which is done by a person. (They don't pay Rachel Riley just to be resident eye candy, you know...)
Think I'll fix this...
Oddly enough (little anecdote) the "computer" has a name, "Cecil" (Countdown's Electonic Calculator In Leeds or some such)
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How well does it match the trope?