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kati45 [8]
4 years ago
12

Sigma1^30 (3n + 7) = [? ]

Mathematics
1 answer:
andrey2020 [161]4 years ago
3 0

Answer:

1425

Step-by-step explanation:

∑ 1 ^30 (3n+1)=4+7+10+... 30 terms

a=4

n=30

d=7-4=3

S_{30}=\frac{30}{2}[2 \times 4+(30-1) \times 3]\\=15[8+87]\\=15 \times 95\\=1425

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