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Answer:
According to the given condition,we have
(n-1)(n+1)-r = 24m,
where m is an integer,and therefore,
r = n²-1-24m.
1.Let m=0,n=3,we have r=8.Note that 2 is not a factor of n when n=3.
2.Let m=0,n=2,we have r=3.Note that 3 is not a factor of n when n=2.
1年前
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