Find the sum of the first ๐Ÿ๐ŸŽ terms of geometric progression ๐Ÿ๐Ÿ–, ๐Ÿ—, ๐Ÿ’.๐Ÿ“, โ€ฆ

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ะŸะพะบะฐะทะฐั‚ัŒ ะพะฟะธัะฐะฝะธะต
Find the sum of the first ๐Ÿ๐ŸŽ terms of geometric progression ๐Ÿ๐Ÿ–, ๐Ÿ—, ๐Ÿ’.๐Ÿ“, โ€ฆ
ะ ะตะบะพะผะตะฝะดะฐั†ะธะธ ะฟะพ ั‚ะตะผะต