216k views
2 votes
Sigma1^30 (3n + 7) = [? ]

2 Answers

5 votes

Answer:

1425

Explanation:

∑ 1 ^30 (3n+1)=4+7+10+... 30 terms

a=4

n=30

d=7-4=3


S_(30)=(30)/(2)[2 * 4+(30-1) * 3]\\=15[8+87]\\=15 * 95\\=1425

User Mujahid Daud Khan
by
8.2k points
4 votes

Answer:

1605

Explanation:

hope this helps you guys on acellus

User Esseara
by
8.7k points
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