how to check whether Consider the binary operation ∗:ℚ × ℚ → ℚ defined by ∗ = 5 7 (a) Show that ∗ is commutative ? (b) Show that ∗ is associative ? (c) Find the identity for ∗, if any ? (d) Are elements ℚ of invertible? If so find the inverse of an element ? (e) Write the inverse of −1 2 , if it exists the function is invertible
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yes ×is the the answer for your question dear friend commutative
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