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An A.P. consist of even number of terms ...

An A.P. consist of even number of terms 2n having middle terms equal to 1 and 7 respectively. If n is the maximum value which satisfy `t_(1) t_(2n) + 713 gt= `0, then the value of the first term of the series is

A

17

B

`-15`

C

21

D

`-23`

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The correct Answer is:
D
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