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Re: What is the units digit of 18! + 4!?
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19 Apr 2016, 05:08

1

5

Bunuel wrote:

What is the units digit of 18! + 4!?

A. 0 B. 1 C. 2 D. 3 E. 4

Hi

anything above 4! such as 5!, 6! etc are always multiple of 10, so their units digit is 0.. So units digit of 18! + 4! will depend on 4! = 4*3*2=24 ans $ E
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Re: What is the units digit of 18! + 4!?
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19 Apr 2016, 10:17

18! 8 * 7 * 6 * 5 and it already ends there as units digits 5 and 6 will render 0

4 times 3 times 1 gives 4 as a units digit, 0 and 4 give 4
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Took the Gmat and got a 520 after studying for 3 weeks with a fulltime job. Now taking it again, but with 6 weeks of prep time and a part time job. Studying every day is key, try to do at least 5 exercises a day.

Re: What is the units digit of 18! + 4!?
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21 Apr 2016, 17:09

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2

The trick is to remember that any number above 4! such as 5!, 6! etc are always multiple of 10 (since they will have at least a 5 in the calculation), so their units digit is 0.

So units digit of 18! + 4! will depend on 4! which is 4*3*2=24 Correct Option : E

We can see that the any number's factorial, if that number is greater than 4 will have a units digit of 0.

Coming back to our question, We have been asked to calculate the units digit of 18! + 4!, which in essentially the units digit of 4! : 4(Option E) _________________

You've got what it takes, but it will take everything you've got

Re: What is the units digit of 18! + 4!?
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02 Sep 2018, 05:52

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