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Que. 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
Answer:( A, + ) is a monoid but not group
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