Set Theory and Algebra MCQ

1:

If a, b are positive integers, define a * b = a where ab = a (modulo 7), with this * operation, then inverse of 3 in group G (1, 2, 3, 4, 5, 6) is

A.

3

B.

1

C.

5

D.

4

 

Answer : C

Explanation :

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Option: A

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