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Find the sum of the sequence …

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Find the sum of the sequence 5, 55, 555... to n terms .

    • Posted by Shahanur Ali 6 years ago

    CBSE > Class 11 > Mathematics
    • 2 answers

    Sandeep Kumar 6 years ago

    5(1,11,111+...+ n) 5/9(9+99+999+...+n) 5/9(10-1+100-1+1000-1+...+n) 5/9(10+100+1000+...+(-1)^n) because 10 +100+1000 are in GP so,we are using the formula of sum of GP. 5/9{10(10^n-1/9)+(-1)^n}

    0Thank You

    Jigar Jat 6 years ago

    5/81(10×(10^n-1)-9n)

    0Thank You

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