\( 1,-a, a^{2},-a^{3}, \ldots n \) पदों तक (यदि \( a \neq-1 \) ) प्रत्येक गुणोत्तर श्रेणी का योग...

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\( 1,-a, a^{2},-a^{3}, \ldots n \) पदों तक (यदि \( a \neq-1 \) )
प्रत्येक गुणोत्तर श्रेणी का योगफल निर्दिष्ट पदों तक ज्ञात कीजिए।
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