Find the sum:  7+77+777+.....upto n terms.

Hi Heenal!
Here is the answer to your question.
 
7 + 77 + 777 + … to n terms
Let Sn = 7 + 77 + 777 + … to n terms
 
Hope you got the answer.
 
Cheers!

  • 96

please explain more eaisly ....!!

can't understand....!!

:(

sn = n/2 [2a+(n-1)d)]

i can't understand what u have done..!!!

:(

:(

  • 0
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