1.

48 - [ 18 - \{ 16 - ( 5 - 4 - 1 ) \} ]

Answer»

48 - [ 18 - { 16 - ( 5 - 4 - 1 )}] = 48 - [ 18 - { 16 }] = 48 - [18 - 16 ] = 48 - 2 = 46



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