If ${a_1}, {a_2}, {a_3}, \dots, {a_n}$ are in $H.P.$,then the expression ${a_1}{a_2} + {a_2}{a_3} + \dots + {a_{n - 1}}{a_n}$ is equal to:
- A${a_1}{a_n}$
- B$n{a_1}{a_n}$
- C$(n - 1){a_1}{a_n}$
- DNone of these
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