Find The Sum Of The First 10 Terms Of The Arithmetic Sequence Of The First Term Is 3 And The Tenth Term Is 39?

Find the sum of the first 10 terms of the arithmetic sequence of the first term is 3 and the tenth term is 39?

Answer:

210

Step-by-step explanation:

$n = 10 \: \: \: \: \: a1 = 3 \: \: \: \: \: an = 39$

$= \frac{n}{2} (a1 + an)$

$= \frac{10}{2} (3 + 39)$

$= 5(42)$

$= 210$

Therefore, the sum of all terms is 210.

I hope that I helped you. GL in your study bro :D :D :D

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