Solve the problem.
-$\text { If } \sum a _ { n } \text { is a convergent series of nonnegative terms, what can be said about } \sum a _ { n } a _ { n + 1 } \text { ? }$
A) Always diverges
B) May converge or diverge
C) Always converges

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The Answer of Solve the problem.
-$\text { If } \sum a _ { n } \text { is a convergent series of nonnegative terms, what can be said about } \sum a _ { n } a _ { n + 1 } \text { ? }$
A) Always diverges
B) May converge or diverge
C) Always converges