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Sagot :
Answer:
0.5+1.1+1.7+2.3+2.9+3.5+4.1+4.7+5.3+5.9+6.5+7.1+7.7+8.3+8.9+9.5+10.1+10.7+11.3+11.9
Step-by-step explanation:
tell me if this isn't 20 terms
Answer:
[tex]S_{20}[/tex] = 124
Step-by-step explanation:
The sum to n terms of an arithmetic series is
[tex]S_{n}[/tex] = [tex]\frac{n}{2}[/tex] [ 2a₁ + (n - 1)d ]
where a₁ is the first term and d the common difference
Here a₁ = 0.5 and d = a₂ - a₁ = 1.1 - 0.5 = 0.6 , then
[tex]S_{20}[/tex] = [tex]\frac{20}{2}[/tex] [ (2 × 0.5) + (19 × 0.6) ]
= 10 (1 + 11.4 )
= 10 × 12.4
= 124
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