Find the sum of $1 + 3 + 7 + 15 + 31 + . . . . .$ upto n terms

2^{n + 1} n - 2 n

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2^{n + 2} - n - 2

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2^{n} - n - 2

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None of these

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Solution

The correct option is A $2^{n + 1} n - 2 n$

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