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http://prntscr.com/kzh1ct

 Sep 27, 2018
 #1
avatar+101872 
+2

The trird term is 13  and the fourth term is 18

 

So....the common difference  =  5

 

To find the first term, we have

 

13 - 2d  =   13 - 2(5)   = 13  - 10    =  3

 

So....the 50th term is

 

3 + 5 (50 - 1)  =

 

3 + 5(49)  =

 

248  ⇒ "A"

 

cool cool cool

 Sep 27, 2018

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