take a = __6, b = 9 , c = 5 and verify that ( ii) a – b = b – a (iv) a – ( b – c ) = ( a – b ) – c​

take a = __6, b = 9 , c = 5 and verify that ( ii) a – b = b – a (iv) a – ( b – c ) = ( a – b ) – c​

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