## 123lal Find the sum of the first 38 terms of the arithmetic sequence: 3, 8, 13, 18, 23, ... 11 months ago 11 months ago

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1. SandeepReddy

Which series is it?

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

3. SandeepReddy

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

4. SandeepReddy

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