+0  
 
+1
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avatar+293 

please explain how to do this.

 Dec 3, 2020
 #1
avatar
+1

This is given by: Sn = ½ n [ 2a + (n - 1)d ]         you are given all of the inputs.....this is HOW you solve it.  (a is a1)

 Dec 3, 2020

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