What are the first five terms of this sequence?

Question

a_n=2a_n-1 , where a₁=2

Answer 1

a_n = 2a_n-1

a₁ = 2

a₂ = 2(a₁) = 2(2) = 4

a₃ = 2(4) = 8

a₄ = 2(8) = 16

a₅ = 2(16) = 32

a₆ = 2(32) = 64

etc.