Find the sum of the arithmetic sequence having the data given a_1=5, a_n=3, n = 20

Paloma Sanford 2022-10-15 Answered
Find the sum of the arithmetic sequence having the data given a 1 = 5 , a n = 3 , n = 20
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Answers (1)

jbaekk7q
Answered 2022-10-16 Author has 18 answers
The information give gives you the first term, the last term and the number of terms. This means we can use the formula S n = ( n 2 ) ( a + t n ) .
S 20 = ( 20 2 ) ( 5 + 3 )
S 20 = 10 ( 8 )
S 20 = 80
Your sum is 80.
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