First statement, assume n=1-->(n-1)(n+1) = 0, and remainder(r) = 0 when divided by 24. Similarly, assume n=3-->(n-1)(n+1) = 8, and remainder(r) = 8, when divided by 24. NO unique numerical value, Insufficient. Second statement,assume n=1, just as above, and r=0.Again, assume n=2, and r = 3. In...