Find the sum of the sequence 7, 77, 777, 7777, . . . to n terms.

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Find the sum of the sequence 7, 77, 777, 7777, . . . to n terms.
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more clear explanation can be given and some basic steps are not written

SujataJamshetty-pxkk
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Why can't school teach like this... :(

Akhil-_-
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Koi batayega ki kyu 9 se multiply aur divide kiya gaya hai....??

Nehabhardwaj
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Maths sam ja ne se pehle number likna shik jao

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