The problem asks us to find the next three terms of the recursive sequence defined by $a_n = 2a_{n-1} - 1$ for $n \ge 2$, with the initial term $a_1 = 3$.

Discrete MathematicsSequencesRecursive Sequences
2025/6/6

1. Problem Description

The problem asks us to find the next three terms of the recursive sequence defined by an=2an11a_n = 2a_{n-1} - 1 for n2n \ge 2, with the initial term a1=3a_1 = 3.

2. Solution Steps

We are given the recursive formula an=2an11a_n = 2a_{n-1} - 1 and a1=3a_1 = 3. We need to find a2,a3,a_2, a_3, and a4a_4.
For n=2n=2:
a2=2a211=2a11=2(3)1=61=5a_2 = 2a_{2-1} - 1 = 2a_1 - 1 = 2(3) - 1 = 6 - 1 = 5.
For n=3n=3:
a3=2a311=2a21=2(5)1=101=9a_3 = 2a_{3-1} - 1 = 2a_2 - 1 = 2(5) - 1 = 10 - 1 = 9.
For n=4n=4:
a4=2a411=2a31=2(9)1=181=17a_4 = 2a_{4-1} - 1 = 2a_3 - 1 = 2(9) - 1 = 18 - 1 = 17.

3. Final Answer

The next three terms are 5, 9, and 17.

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