If a and b are two non parallel vectors and the position vectors of P, Q and R are a 2b, 1 2a 3 4b, and a b, find the value of if P, Q, and R lie on a straight line

Question: If a and b are two non-parallel vectors and the position vectors of P, Q and R are a + 2b, 1/2a + 3/4b, and

If a and b are two non-parallel vectors and the position vectors of P, Q and R are a + 2b, 1/2a + 3/4b, and λa + b, find the value of λ if P, Q, and R lie on a straight line.

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