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Chisinau MO p36 1949-56 VIII-IX sum 1+ 2q + 3q^2 +...+nq^{n-1}

Source:

March 15, 2021
algebraSum

Problem Statement

Calculate the sum: 1+2q+3q2+...+nqnāˆ’11+ 2q + 3q^2 +...+nq^{n-1}