## anonymous 3 years ago Find the sum of the first 38 terms of the arithmetic sequence: 3, 8, 13, 18, 23, ...

• This Question is Open
1. anonymous

Which series is it?

2. anonymous

a=3 n=38 d=5 $sum=n\frac{(2a+(n-1)d)}{2}$

3. anonymous

Its in the AP, because every next term has a constant difference with the preceding term

4. anonymous

So @Jonask Formula holds for it , apply and get the result.