Anku posted an Question
August 12, 2021 • 21:00 pm 30 points
  • IIT JAM
  • Mathematics (MA)

How to solve pls once show steps...

how to solve pls once show steps.... . . . . . .. . . . .. . . . . .. . . ..

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  • Ankur Rao Best Answer

    3*3*3*3=81 which is congruent to 1mod(20) so the order of 3 is 1.

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    as per ans key its 4.... .

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    sorry, it is 4 because on operating 3 four time we are getting identity (1).

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    pls can u once tell which group is Z20,*

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    U(20)

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    it contains element less then 20 and which are relatively prime to 20.

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    sir pls can u once tell how then we denote multiplicative group of integers...i always gets confused

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    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.

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    ok..got it now sir..thanks a lot sir

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    https://youtu.be/28GYv1FqRdg

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