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![[Post New]](/templates/default/images/icon_minipost_new.gif) 18 Apr 2008 13:23:59 IST
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LET a ,b and c b three non-vectors no two of which are collinear, if a + 2b is collinear wit c and b+3c is collinear with a, then a+2b+6c=
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18 Apr 2008 19:39:27 IST
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a+2b=tc b+3c=sa b=sa-3c sub in 1st eq => a+2(sa-3c)=tc a-6c=-2sa+tc =>t=-6 sub in 1st eq a+2b=-6c a+2b+6c=0
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