Thread: Modulo Arithmetic

Hey guys. Could somebody help me please?

i was ill the day the lecture on modulo was on and lecture notes dont make sence to me

please help me?



a) find a number in Z/7 which gives 1 mod 7 when multiplied by 3

b) use the answer to (a) to solve the equation 3n=4 in Z/7


thank you guys!


Best Regards

Originally Posted by boomshine57th

Hey guys. Could somebody help me please?

i was ill the day the lecture on modulo was on and lecture notes dont make sence to me

please help me?



a) find a number in Z/7 which gives 1 mod 7 when multiplied by 3

b) use the answer to (a) to solve the equation 3n=4 in Z/7


thank you guys!


Best Regards

a. b/c
b. similar to part a.

Originally Posted by boomshine57th

Hey guys. Could somebody help me please?

i was ill the day the lecture on modulo was on and lecture notes dont make sence to me

please help me?



a) find a number in Z/7 which gives 1 mod 7 when multiplied by 3

To coin a phrase, "just DO it". What is 3*1 (mod 7)? What is 3*2 (mod 7)? What is 3*3 (mod 7)? What is 3*4 (mod 7)? What is 3*5 (mod 7)? ?What is 3*6 (mod 7)?

b) use the answer to (a) to solve the equation 3n=4 in Z/7

I don't see how the answer to (a) helps to solve that equation but the [b]method does: while you were calculating those, which was congruent to 4 (mod 7)?

thank you guys!


Best Regards