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Let r=a+lambdal and r=b+mum br be two li...

Let `r=a+lambdal and r=b+mum` br be two lines in space, where `a= 5hat(i)+hat(j)+2hat(k), b=-hat(i)+7hat(j)+8hat(k), l=-4hat(i)+hat(j)-hat(k), and m=2hat(i)-5hat(j)-7hat(k)`, then the position vector of a point which lies on both of these lines, is

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