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Question

The minimized form of logic expression ¯¯¯¯A.¯¯¯¯B.¯¯¯¯C+¯¯¯¯AB¯¯¯¯C+¯¯¯¯ABC+AB¯¯¯¯C will be

A
¯¯¯¯A.¯¯¯¯B+A¯¯¯¯C
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B
¯¯¯¯A.¯¯¯¯C+¯¯¯¯AB+B¯¯¯¯C
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C
¯¯¯¯A.¯¯¯¯C+BC
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D
¯¯¯¯A.¯¯¯¯B+AC+BC
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Solution

The correct option is B ¯¯¯¯A.¯¯¯¯C+¯¯¯¯AB+B¯¯¯¯C
Given,
Y=¯¯¯¯A.¯¯¯¯B.¯¯¯¯C+¯¯¯¯AB¯¯¯¯C+¯¯¯¯ABC+AB¯¯¯¯C

=¯¯¯¯A.¯¯¯¯C(¯¯¯¯B+B)+¯¯¯¯ABC+AB¯¯¯¯C

=¯¯¯¯A.¯¯¯¯C+¯¯¯¯ABC+AB¯¯¯¯C

=¯¯¯¯A(¯¯¯¯C+BC)+AB¯¯¯¯C

=¯¯¯¯A(¯¯¯¯C+C)(¯¯¯¯C+B)+AB¯¯¯¯C

=¯¯¯¯A.¯¯¯¯C+¯¯¯¯AB+AB¯¯¯¯C=¯¯¯¯A.¯¯¯¯C+B(¯¯¯¯A+A¯¯¯¯C)

=¯¯¯¯A.¯¯¯¯C+B(¯¯¯¯A+A)(¯¯¯¯A+¯¯¯¯C)

​​​​​​​=¯¯¯¯A.¯¯¯¯C+¯¯¯¯AB+B¯¯¯¯C

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