Let A = { 1,2,3,4,…….∞ } and a binary operation ‘+’ is defined by a + b = ab ∀ a,b ∈ A. Which of the following is true ?(A) ( A, + ) is a semi group but not monoid(B) ( A, + ) is a monoid but not group(C) ( A, + ) is a group(D) ( A, + ) is not a semi group

Let A = { 1,2,3,4,…….∞ } and a binary operation ‘+’ is defin

1.	Let A = { 1,2,3,4,…….∞ } and a binary operation ‘+’ is defined by a + b = ab ∀ a,b ∈ A. Which of the following is true ?(A) ( A, + ) is a semi group but not monoid(B) ( A, + ) is a monoid but not group(C) ( A, + ) is a group(D) ( A, + ) is not a semi group
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Let A = { 1,2,3,4,…….∞ } and a binary operation ‘+’ is defined by a + b = ab ∀ a,b ∈ A. Which of the following is true ?(A) ( A, + ) is a semi group but not monoid(B) ( A, + ) is a monoid but not group(C) ( A, + ) is a group(D) ( A, + ) is not a semi group

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