Answer:
x, 2x+1, 4x+3, 8x+7
Step-by-step explanation:
If we call the first term x, then the subsequent term is 2x+1. Then, the next term is 2(2x+1)+1=4x+2+1=4x+3. Then, the fourth term is 2(4x+3)+1=8x+6+1=8x+7.
As a matter of fact, the nth term is given by [tex]2^{n-1}x+2^{n-1}-1[/tex] for starting term x.
