Peaches to plums. 15 divided by 3 is 5, 12 divided by 3 is 4.

Which expression?? Can u please post it I wanna help!

**Answer:**

The partial sum is** 561**

**Step-by-step explanation:**

**Given:**

**The arithmetic series = 9+12+15...+51+54+57**

Partial sum between 9 and 57, with d=3

**To Find :**

The partial sum = ?

**Solution**

The given series is a arithmetic series with difference 3.

So the series is

**9,12,15,18,21,24,27,30,33,36,29,42,45,48,52,51,54,57**

Thus There are 17 terms,

Here the is a middle term is the the ninth,

The 9 term is

Now the

The partial sum is **33 x 17 = 561**

Greater than hope you get good grade:)