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Find the sum of the sequence 7, 77, 777,...

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

Text Solution

Verified by Experts

The correct Answer is:
`7/9[(10(10^(n-1)))/9-n]`
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Knowledge Check

  • The sum of first 20 terms of the sequence 0.7 , 0.77 , 0.777,... is

    A
    `7/9 (99 - 10^-20)`
    B
    `7/9 (99 + 10^-20)`
    C
    `7/81 (179 + 10^-20)`
    D
    `7/81 (179 - 10^-20)`

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