Find the sum to n terms of the series 7 + 77 + 777 +

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som777 ถอนเงินไม่ได้ Mwen pase nwit ap repase chante yo, m'ap kalkile anpil nan kè m', m'ap egzaminen, m'ap di: 7 Eske Seyè a voye m' jete nèt? Eske li p'ap janm