+1712 The sum of the first 3 terms of a geometric series is 171 and the common ratio is 2/3.
What is the first term of the series?
I Don't know what to do- it says I have to use formula?
+6248 \(\text{well then you should know that the sum of the first three terms are}\\ a + \dfrac 2 3 a + \dfrac 4 9 a = \dfrac{19}{9}a = 171\\ a=81\)
+1712 ok, thank you, Rom!
I got that answer too, I just forgot to post it...
