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Q.

If |a¯|=|b¯|=|c¯|=1,a¯·b¯=b¯·c¯=c¯·a¯=12 then [a¯b¯c¯]=

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a

1

b

12

c

12

d

32

answer is C.

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Detailed Solution

a¯.b¯.c¯2=a¯.a¯        a¯.b¯         a¯.c¯ b¯.a¯      b¯.b¯         b¯.c¯ c¯.a¯      c¯.b¯          c¯.c¯      =1            12           12  12            1            12  12           12           1       =12∴[a¯b¯c¯]=12
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