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Let n>1 be a composite number. Prove that n does not divide (n - 1)! - 1(Hint: Factor n as n = ab with a,b < n. Argue by contradiction)? Given U= ln(x squared + y squared)Show that it is harmonic hence find a conjugate Harmonic function and write the function f(z)..? . If a car traveling 50 mph can stop in 110 ft, how many feet will it take the same car to stop when it is traveling 100 mph? Hello, can anyone tell me what crystals/ minerals these are? I notice the purple amethyst and rose Quartz? Not sure about the others. Thank? Does anyone have codes for Boxlunch money April 2017?