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alexira [117]
3 years ago
5

Find the sum of the arithmetic sequence. -10,-7,-4,-1,2,5,8

Mathematics
1 answer:
Kazeer [188]3 years ago
6 0

Answer:

example

Find the 21st term of: 2,8,14,20

a1=2

d=6

n=21

a21= 2+ (21-1)6

a21= 2+ (20)6

a21= 2+120

a21= 122

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