Use Eq. (3.13) to obtain Eq. (3.9). Hint: First multiply both sides of Eq. (3.13) by n,

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Use Eq. (3.13) to obtain Eq. (3.9).

Hint: First multiply both sides of Eq. (3.13) by n, then write a new equation by replacing n with n− 1, and then subtract the former from the latter.

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