Difference between revisions of "2019 AMC 10A Problems/Problem 2"

Latest revision as of 18:14, 4 November 2024

Problem

What is the hundreds digit of $(20!-15!)?$

$\textbf{(A) }0\qquad\textbf{(B) }1\qquad\textbf{(C) }2\qquad\textbf{(D) }4\qquad\textbf{(E) }5$

Solution 1

Because we know that $5^3$ is a factor of $15!$ and $20!$ , the last three digits of both numbers is a $0$ , this means that the difference of the hundreds digits is also $\boxed{\textbf{(A) }0}$ .

Solution 2

We can clearly see that $20! \equiv 15! \equiv 0 \pmod{1000}$ , so $20! - 15! \equiv 0 \pmod{100}$ meaning that the last two digits are equal to $00$ and the hundreds digit is $\boxed{\textbf{(A)}\ 0}$ .

--abhinavg0627

Solution 3 (Brute Force)

$20!= 2432902008176640000$ $15!= 1307674368000$

Then, we see that the hundreds digit is $0-0=\boxed{\textbf{(A)}\ 0}$ .

~dragoon

Please do not do this and only use this solution as a last resort.

Video Solution by Education, the Study of Everything

https://youtu.be/J4Bqztwjyxw

~Education, The Study of Everything

Video Solution by WhyMath

https://youtu.be/V1fY0oLSHvo

~savannahsolver

Video Solution by OmegaLearn

https://youtu.be/zfChnbMGLVQ?t=3899

~pi_is_3.14

2019 AMC 10A (Problems • Answer Key • Resources)
Preceded by Problem 1	Followed by Problem 3
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All AMC 10 Problems and Solutions

The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions.

@@ Line 4: / Line 4: @@
 <math>\textbf{(A) }0\qquad\textbf{(B) }1\qquad\textbf{(C) }2\qquad\textbf{(D) }4\qquad\textbf{(E) }5</math>
-==Video Solution 1==
+==Solution 1==
+Because we know that <math>5^3</math> is a factor of <math>15!</math> and <math>20!</math>, the last three digits of both numbers is a <math>0</math>, this means that the difference of the hundreds digits is also <math>\boxed{\textbf{(A) }0}</math>.
-https://youtu.be/J4Bqztwjyxw
+==Solution 2==
-Education, The Study of Everything
+We can clearly see that <math>20! \equiv 15! \equiv 0 \pmod{1000}</math>, so <math>20! - 15! \equiv 0 \pmod{100}</math> meaning that the last two digits are equal to <math>00</math> and the hundreds digit is <math>\boxed{\textbf{(A)}\ 0}</math>.
+--abhinavg0627
+==Solution 3 (Brute Force)==
-==Video Solution 2==
+<math>20!= 2432902008176640000</math>
-https://youtu.be/V1fY0oLSHvo
+<math>15!= 1307674368000</math>
-~savannahsolver
+Then, we see that the hundreds digit is <math>0-0=\boxed{\textbf{(A)}\ 0}</math>.
-== Video Solution == 3
+~dragoon
-https://youtu.be/zfChnbMGLVQ?t=3899
-~ pi_is_3.14
+Please do not do this and only use this solution as a last resort.
-==Solution 3==
+==Video Solution by Education, the Study of Everything==
-Because we know that <math>5^3</math> is a factor of <math>15!</math> and <math>20!</math>, the last three digits of both numbers is a 0, this means that the difference of the hundreds digits is also <math>\boxed{\textbf{(A) }0}</math>.
-==Solution 4==
+https://youtu.be/J4Bqztwjyxw
-We can clearly see that <math>20! \equiv 15! \equiv 0 \pmod{100}</math>, so <math>20! - 15! \equiv 0 \pmod{100}</math> meaning that the last two digits are equal to <math>00</math> and the hundreds digit is <math>0</math>, or <math>\boxed{\textbf{(A)}\ 0}</math>.
+~Education, The Study of Everything
---abhinavg0627
+==Video Solution by WhyMath==
+https://youtu.be/V1fY0oLSHvo
-==Solution 5 (Brute Force)==
+~savannahsolver
-<math>20!= 2432902008176640000</math>
+==Video Solution by OmegaLearn==
-<math>15!= 1307674368000</math>
-Then, we see that the hundred digit is <math>0-0=0</math>
+https://youtu.be/zfChnbMGLVQ?t=3899
--dragoon
+~pi_is_3.14
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