1. The problem states that the power of the number three is $n+1$. 2. This means we are dealing with the expression $3^{n+1}$. 3. To understand or simplify this, recall the exponent rule: $a^{m+n} = a^m \times a^n$. 4. Applying this rule, we can write: $$3^{n+1} = 3^n \times 3^1 = 3^n \times 3$$ 5. So, $3^{n+1}$ is equal to three times $3^n$. 6. This expression is useful in sequences or series where powers of 3 increase by 1 in the exponent. Final answer: $$3^{n+1} = 3 \times 3^n$$