12 - [3 - {6 - (5 - 1)}]=11
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12 - [3 - {6 - (5 - 1)}]=11
12 - [ 3 - { 6 - 4 } ] = 11
12 - [ 3 - 2 ] = 11
12 - 1 = 11
11 = 11
hence proved
hope it helps you...
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