# Math Help - Plzz reply urgent!!!

find the remainder if 8^401 is divided by 13

2. ## Re: Plzz reply urgent!!!

Do you know Fermat's little theorem?

8^12 = 1 mod 13

8^401 = (8^12)^33 (8^5)

3. ## Re: Plzz reply urgent!!!

yes i know the theoremm... i wanted to check the answer which i got

4. ## Re: Plzz reply urgent!!!

Originally Posted by tejashree24
yes i know the theoremm... i wanted to check the answer which i got
Then you should have posted it.

BTW it's easy to check it yourself.

8&#94;401 mod 13 - Wolfram|Alpha

5. ## Re: Plzz reply urgent!!!

yes thank you for the same...

6. ## Re: Plzz reply urgent!!!

also... i have one more question
solve the following system of equations using matrix inversion method :
3x+y+2z=3
2x-3y-z=-3
x+2y+z=4

I'm having a paper tomorrow.. plz send me the steps if you can