Fermat's Little Theorem examples
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- Опубліковано 3 лип 2024
- Find the least residue (modulo p) using Fermat's Little Theorem; or find the remainder when dividing by p. We start with a simple example, so that we can easily check the answer, then look at much bigger numbers where the answers cannot be directly checked on a calculator.
0:00 Fermat's Little Theorem: Least residue of a large number...
0:20 ...or: Remainder when dividing by a prime
0:50: Formula
1:50 Small Example
5:30 Big Example
8:40 Very Big Example
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This was honestly so helpful. I could not for the life of me understand how modulo notation worked, and seeing this explained with the theorem got me unstuck in the middle of a project. Thank you so much!
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Sometimes it’s better to see an application first, and only thereafter lean into the theory. Thanks, Jay, for starting me on the path towards understanding this beautiful theorem. Your examples were incredibly poignant 🏆🙌🏽🎊
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Glad I could help! ¡Estoy aprendiendo español!
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Now with SUBTITLES
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Favorite video on Fermat's Little theorem, I like seeing examples.
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Jay
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Jay
Maths with Jay
I've been looking around for something particular, maybe you know the answer. How can you do this exact thing but without prime numbers? For example, Find the remainder of 9^342 | 10
+Jake Moore This is a different situation, so think about it in a different way: Start by writing down the first few powers of 9, find the remainders when you divide by 10, and you will see a simple pattern...
Great help! Thanks!
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i am from india jay, a student. We learn this type of things in senior High School (11th standard) but the methods are harder(Binomial theorem). This method is great.
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Maths with Jay in countries such as India complex topics like number theory are introduced to students as early as secondary school. But these are just introducing the topic. When we get to college/uni that is when we learn it at the advanced level.
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Have i understood correctly here:
7^50 (mod 13)
Since 7^12 = 1 mod 13
50 = 4 * 12 + 2
So 7^50 = 7^(4*12+2)
= 1^4 * 7^2
= 1 * 49
= 10 mod 13
So least residue is 10 ?
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Maths with Jay 13 tears old. We do this topic in our enrichment work (early high school in Australia )
@Nordin: Wow! That's impressive. I'm teaching this at a university. (By the way, in the UK, our year 7 students are 11 - 12 years old.)
Nordin Zuber I also need it for tomorrow for an Indonesian Olympiad for grade 9. And I'm also Grade 7.
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