If \[{{a}_{1}},\ {{a}_{2}},\ {{a}_{3}},...............,\ {{a}_{n}}\] are in H.P., then \[{{a}_{1}}{{a}_{2}}+{{a}_{2}}{{a}_{3}}+\] \[..........+{{a}_{n-1}}{{a}_{n}}\] will be equal to [IIT 1975]

If \[{{a}_{1}},\ {{a}_{2}},\ {{a}_{3}},...............,\ {{a}_{n}}\] a

1.	If \[{{a}_{1}},\ {{a}_{2}},\ {{a}_{3}},...............,\ {{a}_{n}}\] are in H.P., then \[{{a}_{1}}{{a}_{2}}+{{a}_{2}}{{a}_{3}}+\] \[..........+{{a}_{n-1}}{{a}_{n}}\] will be equal to [IIT 1975]
A.	\[{{a}_{1}}{{a}_{n}}\]
B.	\[n{{a}_{1}}{{a}_{n}}\]
C.	\[(n-1){{a}_{1}}{{a}_{n}}\]
D.	None of these
Answer» D. None of these

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If \[{{a}_{1}},\ {{a}_{2}},\ {{a}_{3}},...............,\ {{a}_{n}}\] are in H.P., then \[{{a}_{1}}{{a}_{2}}+{{a}_{2}}{{a}_{3}}+\] \[..........+{{a}_{n-1}}{{a}_{n}}\] will be equal to [IIT 1975]

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