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what is the units digit of 987654321       

 Jan 28, 2021
 #1
avatar+819 
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We only need to focus on the last digit. 

 

7^(654321)

note that the last digit repeats 7, 9, 3, 1

654321/4 has a remainder of 1. 

The first digit in the sequence 7, 9, 3, 1 is 7. 

So the answer is 7. 

 

I hope this helped. :)))

 

=^._.^=

 Jan 28, 2021
 #2
avatar+267 
0

Hint: Find a pattern! 

 Jan 28, 2021

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