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Q.

The three vectors A→ = 3i^−2j^+k^, B→ = i^−3j^+5k^ and C→ = 2i^+j^−4k^ form

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a

An equilateral triangle

b

An isosceles triangle

c

A right angled triangle

d

No triangle

answer is C.

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Detailed Solution

A→ = 3i^−2j^+k^, B→ = i^−3j^+5k^, C→ = 2i^+j^−4k^|A|→ = 32+(−2)2+12  =  9+4+1  =  14|B|→ = 12+(−3)2+52  =  1+9+25  =  35|C|→ = 22+12+(−4)2  =  4+1+16  =  21As B = A2+C2 therefore ABC will be right angled trianlge.
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