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Q.

If a→=2i^+j^+k^,b→=i^+2j^+2k^,c→=i^+j^+2k^ and (1+α)i^+β(1+α)j^+γ(1+α)(1+β)k^  =a→×(b→×c→) then α,β and  γ are

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a

−2,−4,−23

b

2,−4,23

c

−2,4,23

d

2,4,−23

answer is A.

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Detailed Solution

a→×(b→×c→)=(a→⋅c→)b→−(a→⋅b→)c→=5(i^+2j^+2k^)−6(i^+j^+2k^)⇒(1+α)i^+β(1+α)j^+γ(1+α)(1+β)k^=−i^+4j^−2k^⇒1+α=−1,β=−4 and γ(−1)(−3)=−2⇒ γ=−23
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