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What is the units digit of 248^20?

This topic has 2 expert replies and 1 member reply

What is the units digit of 248^20?

Post Fri Sep 22, 2017 10:34 am
What is the units digit of 248^20?

A) 0
B) 2
C) 4
D) 6
E) 8

The OA is D.

How can I find the units digit without making the whole calculus?

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Top Reply
Post Sat Sep 23, 2017 7:33 am
mbouayad14 wrote:
20 is a multiple of 2....so why couldnt rhe answer be 4???
That would be true if it were the case that ALL exponents that are multiples of 2 yielded units digit 4

Cheers,
Brent

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mbouayad14 Newbie | Next Rank: 10 Posts
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Top Reply
Post Sat Sep 23, 2017 7:13 am
20 is a multiple of 2....so why couldnt rhe answer be 4???

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Post Sat Sep 23, 2017 7:33 am
mbouayad14 wrote:
20 is a multiple of 2....so why couldnt rhe answer be 4???
That would be true if it were the case that ALL exponents that are multiples of 2 yielded units digit 4

Cheers,
Brent

_________________
Brent Hanneson – Founder of GMATPrepNow.com
Use our video course along with Beat The GMAT's free 60-Day Study Guide

Check out the online reviews of our course
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