1.

Three vectors 7hati-11hatj+hatk, 5hati+3hatj-2hatk and 12hati-8hatj-hatk forms

Answer»

an EQUILATERAL triangle
an isosceles triangle
a right angled triangle
collinear

Solution :`|(7,-11,1),(5,3,-2),(12,-8,-1)|`
`=7(-3-16)+11(-5+24)+1(-40-36)`
`=-133+209-76=0`
So, the vectors are collinear


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