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Show that ` *: R xxR ->R`defined by `a*b = a +2b`is not commutative. |
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Answer» `a ** b = a+ 2b = 3 +10 = 13` `b ** a = b+ 2a = 5+6 = 11` `a=3, b=5` `a** b cancel(=) b ** a` hence proved |
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