Answer:
90
Step-by-step explanation:)
To obtain [tex]S_{4}[/tex] , sum the first 4 terms, using n = 1 to n = 4
[tex]S_{4}[/tex]
= 6[tex](2)^{0}[/tex] + 6[tex](2)^{1}[/tex] + 6(2)² + 6(3)³
= (6 × 1) + (6 × 2) + (6 × 4) + (6 × 8)
= 6 + 12 + 24 + 48
= 90
