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I'm solving puzzle from the book super excellent and intellegent test. Im stuck on these. Someone said answer should be 983. But how? Can anyone tell me the right answer. thanks.

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  • $\begingroup$ Is that the book with the ISBN 9780956670342 ? $\endgroup$ – Pureferret Jun 17 at 14:38
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    $\begingroup$ @Pureferret 0956670342 $\endgroup$ – Farhan Khan Jun 17 at 14:47
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I think it's because

you can pair up all the other numbers as follows:

632 : 2836
315 : 5163
146 : 6741
385 : 5893

In each pair, the four-digit number has its largest digit removed and then the remaining three digits are reversed to produce the corresponding three-digit number. 983 is the odd one out because there is no four-digit number to pair it with.

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I have another approach, but I will agree with @SQLnoob's logic as it is much more interesting.

The answer is :-

983.

Because :-

983 is the only prime number in the set. All other numbers are composites.

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