SOLUTION: Find the indicated 25th partial sum of the arithmetic sequence. A<sub>#1</sub>=100, A<sub>#25</sub>=220, n=25
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Question 743327
:
Find the indicated 25th partial sum of the arithmetic sequence.
A
#1
=100, A
#25
=220, n=25
Answer by
Edwin McCravy(20056)
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S
#n
=
(A
#1
+ A
#n
) S
#25
=
(100 + 220) S
#25
=
(320) S
#25
= 4000 Edwin
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