Question

100)
11. Find the sum of the following to n terms: 7 - 77 - 777 - 7777
Hint: 5. = 701 - 11 - 111 - 1111 -
- 9 99 999 9999
= -110 - 1) (100 - 1) + (1000 - 1) ...]
ooo
00 - 1000 + ...... -1 -1 -1 ........n times)​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

The sum of all are 305

Step-by-step explanation:

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