Sequences and Series
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Free Maths Q & A Practice
1 of 5 free exam-style exercises in this topic
An arithmetic sequence has \(u_5=17\) and \(u_{12}=45\). Find \(S_{20}\).
Arithmetic-sequence data
Required reasoning
\(a+4d=17\), \(a+11d=45\)
Find \(a,d\), then use \(S_{20}\)
Select the exact answer.
Select one option.
A
800
B
840
C
760
D
900
E
780
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