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Math

Answered

What is the sum of the first 7 terms of the sequence 18,12,8,,...?
a.4118/81
b.2059/729
c.4118/243
d.2059/81

Sagot :

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Answer:

4118/81

Step-by-step explanation:

9=2/3.

So.Sn= A1 (1-9^n) = 18( -2/3^n)

1-9. 1/3

S7=18 (1-(2/3^7) =4118/18.

1/3

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