- #36

fiksx

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##c=k(1,0,0)+b(0,1,0)##ehild said:It is wrong, of course.

If a=(1,0,0) and b=(0,1,0), what should be the third coordinate of c so it is a linear combination of a and b?

The third coordinate is a linear combination of the third coordinates of both a and b, two zeros. What do you get if you combine two zeros?