13 points ill also mark brainliest if correct
2 answers:
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Answer:
90
Step-by-step explanation:)
To obtain , sum the first 4 terms, using n = 1 to n = 4
= 6 + 6
+ 6(2)² + 6(3)³
= (6 × 1) + (6 × 2) + (6 × 4) + (6 × 8)
= 6 + 12 + 24 + 48
= 90