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1. The number obtained from the last two nonzero digits of 2019! is equal to 𝑛𝑛. What is 𝑛𝑛?

 

2. The number obtained from the last two nonzero digits of 2019! is equal to 𝑛𝑛. What is 𝑛𝑛?

 Dec 27, 2019
 #1
avatar
+1

Here are the last 10 non-zero digits of 2019! =2,587,693,056. So, the last two digits multiplied =5 x 6 = 30.

If you meant added together, then: 5 + 6 = 11. Take your pick !!.

 Dec 27, 2019
 #2
avatar+108734 
+1

Was this question meant to be done without a calculator?

 Dec 27, 2019
 #3
avatar+1694 
+1

Probably. 

 

In that case, I would assume trying to solve it guest's way would still work, assuming again that you don't make a math error AND you don't have a time limit...

tommarvoloriddle  Dec 28, 2019
 #4
avatar+108734 
+1

Especially if you are good at maths, live to be 1000000000 years old and have nothing else ot do with your time.

Melody  Dec 28, 2019
 #5
avatar+355 
+3

Yes. I got this problem from my friend. When I searched it up, I found a very similar AMC 10 problem. That's probably where he got it from.

https://artofproblemsolving.com/wiki/index.php/2010_AMC_10A_Problems/Problem_24

hellospeedmind  Dec 28, 2019
 #6
avatar+108734 
0

Thanks Hellospeedmind  cool

Melody  Dec 29, 2019

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