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Let x be a whole number. The remainder is 3 if x is divided by 7. What is the remainder if 3x is divided by 7? In how many distinct ways can the letters of the word SELLS be arranged? Is it possible for a person to run at the speed of light? What are the geometrical differences between the carbon atoms in cyclohexane and benzene? Explain the direction of the electrons movement in a circuit? Why does the flow have to be continuous?