Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Ankur Rao Best Answer
3*3*3*3=81 which is congruent to 1mod(20) so the order of 3 is 1.
as per ans key its 4.... .
sorry, it is 4 because on operating 3 four time we are getting identity (1).
pls can u once tell which group is Z20,*
U(20)
it contains element less then 20 and which are relatively prime to 20.
sir pls can u once tell how then we denote multiplicative group of integers...i always gets confused
that is not a group because let's take an integer 5 so under multiplication its inverse is 1/5 which is not an integer so we are getting an element whose inverse doesn't exist so it is not a group.
ok..got it now sir..thanks a lot sir
https://youtu.be/28GYv1FqRdg