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Question

Given that a=^i+^j+^k,b=^i+^j^k,c=^i+^j^k,The values of the following are
i. (a.b)+(b.c)+(c.a)
ii. (a.c)c+(c.b)a

A
i. 3 ii. 2^i
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B
i. 6 ii. 2^i
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C
i. 1 ii. 2^k
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D
i. 1 ii. 2^j
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Solution

The correct option is C i. 1 ii. 2^k
i. (a.b)=(^i+^j+^k).(^i^j+^k)=11+1=1
(b.c)=(^i^j+^k).(^i+^j^k)=111=1
(c.a)=(^i+^j^k).(^i+^j+^k)=1+11=1
(a.b)+(b.c)+(c.a)=1

ii. (a.c)c=1(^i+^j^k)=(^i+^j^k)
(c.b)a=1(^i+^j+^k)=^i^j^k
(a.c)c+(c.b)a=2^k

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