7+77+777+7777+n digits of 7= 7/81(10^n+1 -9n -10) for all n belongs to natural no - Maths - Sets Relations and Functions

Question

7+77+777+7777+n digits of 7= 7/81(10^n+1 -9n -10) for all n belongs
to natural no??

Ayushi Chaurasiya · Accepted Answer

Here is the answer to your question
7 + 77 + 777 + … to n terms
Let Sn = 7 + 77 + 777 + … to n
terms
<img alt="" src=
"https://s3mn%20mnimgs%20com/img/shared/userimages/mn_images/image/SEv%20png">
After taking common, we will get the answer in desired form
Hope you got the answer
Regards

7+77+777+7777+n digits of 7= 7/81(10^n+1 -9n -10) for all n belongs to natural no??