Finding the last two digits of a number using modular artihmetic
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- Опубліковано 5 чер 2014
- Finding the lass two digits of 7^{7^{7^7}} using properties of congruences.
Example 5.5.6 in Logic and Discrete Mathematics, by W. Conradie and V. Goranko. - Наука та технологія
After searching 2 hours here and there ..I got perfect video ❤️
Fermat's little theorem is another option to figure this out. 7^7^7^7=7^7^7mod(100)=7^7mod(100)=7^3mod(100)=43.
you can do this in a easier way in less time. as you got 7^4 = 1 mod 100. multiply by 85 (7^4)^85 = 1^85mod 100 now multiply by 7^3. 7 ^3 leaves a remainder 43 when divided by 100. so 7^3 * 7^340 = 43 * 1^85 mod 100. that is 7^343 = 43 mod 100.
thank you! great video.
Thank you!
Nicely Explained
Thanks a lot!
thank you!
i swear the amount of times i try to understand this
Still I don't get anything . I can't get anything useful
i don't understand how (7^4)^z changed to 1
Gracias
Will u plz solve me for this find the last two digits of 7^7^7upto so on 7 without congrence relation
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Everything was very well explained and I understood the thing completely.... what frustrates me is the length of these videos, try to speak less (sorry for being blunt).
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Solution is too long.
This can be done within 10 seconds without congruence relation.
Your accent gave me an intraventricular hemorrhage
Thank you!