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Prove that if p|n and q|n, them pq|n. Every integer n>1 has a prime factor? Sometimes a food gives a positive result with the emulsion test but not with the grease spot test, why is this so? Physics, Flat mirror equation.? .Suppose 4.57 g of c8h18 is mixed with 31. g of o2. Calculate the minimum mass of c8h18 that could be left over by the chemical reaction.? A bag contains 5 red marbles, 1 green, 1 lavender, 3 yellows, and 3 orange. How many sets of five marbles include at most one yellow ?