Q An operation * defines on S = {1,2,3,4,5,6} be such that a * b = ab (mod7) - Maths - Inverse Trigonometric Functions

Question

Q An operation * defines on S = {1,2,3,4,5,6} be such that a * b =
ab (mod7) [a,b ∈ s ], show that * is a binary operation and
all the elements of S are invertible

Rambaboo Khatana · Accepted Answer

Q. An operation * defines on S = {1,2,3,4,5,6} be such that a * b = ab (mod7) [a,b ∈ s ], show that * is a binary operation and all the elements of S are invertible.

Q. An operation * defines on S = {1,2,3,4,5,6} be such that a * b = ab (mod7) [a,b $\in$ s ], show that * is a binary operation and all the elements of S are invertible.