choose y in order that the Vectors a=7i+yj+k, b=3i+2j+k, c=5i+3j+k are linearly dependent.
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L-Hopital rule.
L-Hopital rule states that when the limit of f(x)/g(x) is indeterminate(0/0 form) in that conditions the value of limit can be obtained by evaluating the derivatives of f(x) and g(x) i.e[f'(x)/g'(x)].