If \( a_{1}, a_{2}, a_{3} \ldots . \). an are the \( n \) arithmeti...

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If \( a_{1}, a_{2}, a_{3} \ldots . \). an are the \( n \) arithmetic
\( \mathrm{P} \)
W means between \( a \) and \( b \) then \( 2 \sum_{i=1}^{n} a_{i}= \)
(1) \( a b \)
(2) \( n(a+b)] \)
(3) \( n a b \)
(4) \( \frac{a+b}{n} \)
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