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avatar+201 

What is the units digit of 1! + 3! + 5! +7! +9! +11! ?

 Apr 6, 2020

Best Answer 

 #1
avatar+252 
+2

From 5! and beyond, the units digit is always 0 since there is always a multiple of five in there. SO we only have to focus on 1! and 3!. 1! is 1, and 3!=3*2=6. 6+1=7.

7 is the units digit.

 

smileysmileysmiley

 Apr 6, 2020
 #1
avatar+252 
+2
Best Answer

From 5! and beyond, the units digit is always 0 since there is always a multiple of five in there. SO we only have to focus on 1! and 3!. 1! is 1, and 3!=3*2=6. 6+1=7.

7 is the units digit.

 

smileysmileysmiley

MooMooooMooM Apr 6, 2020
 #2
avatar+201 
+1

THANKS! I needed the explanation.

 Apr 6, 2020
 #3
avatar+116 
+2

7 is the unit digit :)smileycool best answer

 Apr 6, 2020
 #4
avatar+201 
+1

Nice job! Thanks!

 Apr 6, 2020

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