If the sequence {CN} = {an} * {BN}, {an} is the arithmetic sequence and {BN} is the proportional sequence Find the sum SN of {CN}

If the sequence {CN} = {an} * {BN}, {an} is the arithmetic sequence and {BN} is the proportional sequence Find the sum SN of {CN}

Multiply both sides of {CN} = {an} * {BN} by the common ratio, and the obtained equation is different from the original equation. The right side of the obtained equation is the equal ratio sequence. Then, sum it according to the equal ratio sequence