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OpenStudy (anonymous):
The product of a number (n-1) and the number (n+1) is always equal to 3x5=4^2-1 6X8=7^2-1 4x6=5^2-1 7X9=8^2-1 5X7=6^2-1 8X10=9^2-1
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jimthompson5910 (jim_thompson5910):
(n-1)(n+1) = n^2-1 So the answer will depend on the value of n
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