Lauramackall1960 Lauramackall1960

09-01-2021
Mathematics

contestada

Find the sum of the first 8 terms of the series 3 + 6 + 9 + …, given that a8 = 24.

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mahanth1112 mahanth1112

09-01-2021

Step-by-step explanation:

You want to use the sum of an arithmetic sequence formula.

(a1 + an) × n/2

a1 is the first term and an is the last term. n is the number of terms.

In this case: (3+24) × 8/2 = 27×8/2 = 27×4 = 108

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