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What type of spectrum would you see just by looking at a cloud of interstellar gas by itself? Let P(x) be a polynomial of degree 5. If P(1)=0, P(3)=1, P(9)=2, P(27)=3 ,P(81)=4 and P(243)=5,what is the coefficient of x in P(x)? What's the advantages of Alu-zinc coated steel sheet? Please help me with math? What is the difference between the interference patterns seen by the Youngâ€™s double slit experiment and the Michelson interferometer?