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10. Show that (1-x-x^2-x^3-x^4-x^5-x^6)^-1 is the generating function for the number of ways a sum of...

10. Show that (1-x-x^2-x^3-x^4-x^5-x^6)^-1 is the generating function for the number of ways a sum of r can occur if a die is rolled any number of times

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