If a sequence is defined by a_n = 2 * a_(n-1) + 1 for n > 1, and a_1 = 3, what is the value of a_4?

✓ Correct Answer: Option B

Given a_1 = 3. Calculate subsequent terms: a_2 = 2(3) + 1 = 7. a_3 = 2(7) + 1 = 15. a_4 = 2(15) + 1 = 31.