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If 7n+1 is a multiple of 4, then what is n mod 4 

???

help? Thank you!

 Aug 5, 2020
edited by Inspirational  Aug 5, 2020
 #1
avatar+169 
+3

No one got an answer? crying

 Aug 5, 2020
 #2
avatar+110715 
+3

If 7n+1 is a multiple of 4, then what is n mod 4 

 

7n+1 = 0 (mod 4)

4n+3n+1 = 0 (mod 4)

3n+1 = 0 (mod 4)

3n = -1 (mod 4)

3n = 3 (mod 4)

n = 1 (mod 4)

 Aug 5, 2020

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