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Let N be the product of all integers from 1 through 10 that are not divisible by 5. What is the units digit of N?

 Apr 6, 2020
 #1
avatar+116 
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Since 1 is not divisible by 2, 3, 4 or 7 while 1000 is divisible by 5, the answer is 228 1 = 227.

 Apr 6, 2020
 #4
avatar+252 
+1

where are you getting this?

MooMooooMooM  Apr 6, 2020
 #2
avatar+252 
+2

The numbers through 1-10 that are not divisible by 10 are 2, 3, 4, 6, 7, 8 and 9(the one doesn't matter.) Multiplying, we get 72576, so the units digit is 6.

 

smileysmileysmiley

 Apr 6, 2020
 #3
avatar+201 
+2

THX!

 Apr 6, 2020

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