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To prove the given formula using the principle of mathematical induction, let's first define the given statement and then follow the steps of induction. The formula we need to prove is: \[ 1 + 3 + 3^2 + 3^3 + \dots + \frac{3^{n+1} - 1}{2} \] ### _____ ________ __________ ______ ______ _______ ____ _______.
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_______ _______ ____ ______ ______ _______ ______ ________ __________.
____ _______ ______ ___ __________ __________.
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_______ _______ ________ ___ ________ _____ ______ __________ ____ ____ __________.
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_____ ______ ____.
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