PreviousQNo.1) Find the value of p such that the vector 2i-j+l, i+1j+2k and 3i+pj+5k are coplanar. QNo.2) if the vectors ai+j+k, i+bj+k and i+j+ck are coplanar then show that; then show that-: 1/(1-a)+1/(1-n)+1/(1-c)=1 QNo.3) If a,b,c be the 3 non-cp;mar vectors such that a=a1l+a2m+a3 b=b1l+b2m+b3n and c=c1l+c2m+c3n then show that [a b c]= determinant [l m n]

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