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Question

a,b,c are non coplanar vectors and p,q,r are defined as p=b×c[bca], q=c×a[cab], r=a×b[abc], then (a+b).p+(b+c).q+(c+a).r is equal to

A
0
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B
1
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C
2
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D
3
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Solution

The correct option is A 3
Given
p=b×c[bca]
q=c×a[cab]
r=a×b[abc]
(a+b)p+(b+c)q+(c+a)r

(a+b)b×c[bca]+(b+c)c×a[cab]+(c+a)a×b[abc]
a(b×c)[bca]+b(b×c)[bca]+b(c×a)[cab]+c(c×a)[cab]+c(a×b)[abc]+a(a×b)[abc]
[abc][bca]+[bbc][bca]+[bca][cab]+[cca][cab]+[cab][abc]+[aab][abc]
1+0+1+0+1+0=3

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