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Question

(a×b)×(c×d)+[a b c]d=

A
0
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B
a
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C
[a b d]b
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D
[a b d]c
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Solution

The correct option is C [a b d]c
Let us take ¯¯¯aׯ¯b as ¯¯¯x
The question becomes ¯¯¯x×[¯¯cׯ¯¯d]+[¯¯¯a¯¯b¯¯c]¯¯¯d
=(¯¯¯x.¯¯¯d)¯¯c(¯¯¯x.¯¯c)¯¯¯d+[¯¯¯a¯¯b¯¯c]¯¯¯d
=[¯¯¯a¯¯b¯¯¯d]¯¯c[¯¯¯a¯¯b¯¯c]¯¯¯d+[¯¯¯a¯¯b¯¯c]¯¯¯d
=[¯¯¯a¯¯b¯¯¯d]¯¯c

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