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Find the sum of the first n terms of th...

Find the sum of the first n terms of the series : `3 + 7 + 13 +21 + 31 +dot dot dot`

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Knowledge Check

  • Find the sum of n terms of the series 1+3 +7 +15 + …

    A
    `[2^n -1)-n]`
    B
    `[(2^n -1) + n]`
    C
    `[2(2^n -1)-n]`
    D
    none of these

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