Let* be the binary operation on N given by a*b=LCM of a and b.Find the identity of * in N

Let ** ' be the binary operation on N given by a**'b = L.c.m. of a and b. Find the identify of ** in N

Let * be the binary operation on N given by x*y=LCM of x,y.Find 9*5?

Let* be the binary operation on N given by a*b=LCM of a and b,Is * associative?

Let* be the binary operation on N given by a*b=LCM of a and b.Which element of N are invertible for the operation*?

Let ** ' be the binary operation on N given by a**'b = L.c.m. of a and b. Which elements of N are invertible for the operation ** ?

Let ** ' be the binary operation on N given by a**'b = L.c.m. of a and b. Find 5**7, 20**16

Let ** ' be the binary operation on N given by a**'b = L.c.m. of a and b. Is ** associative ?

Let ** ' be the binary operation on N given by a**'b = L.c.m. of a and b. Is ** commutative ?

A={1,2,3,4,6},ast is a binary operation on A is defined as aastb=HCF of a and b. Find the identity element.

Let ast be a binary operation on N defined by aastb=HCF of a and b Is ast commutative?