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Can you guys help me on number 11

 

 Oct 2, 2020
 #1
avatar+31098 
+2

Substitute n = 1 into each of a,b,c and d.  It is clear that a, b and c then resut in a number which is not -39.  On the other hand, d does result in -39, so d is the right answer.

 Oct 2, 2020

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