Question

What are the first four terms if a1=5 and an=3an-1?

Answer 1

To find the first four terms of the sequence defined by a1=5 and an=3an-1, we can use recursive formula to generate the terms of the sequence.

a1 = 5

a2 = 3a1 = 3(5) = 15

a3 = 3a2 = 3(15) = 45

a4 = 3a3 = 3(45) = 135

Therefore, the first four terms of the sequence are:

5, 15, 45, 135.