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 Explain whether each of the following production functions exhibits increasing, constant, or decreasing returns to scale

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 Explain whether each of the following production functions exhibits increasing, constant, or decreasing returns to scale.  Here, L, K, and M respectively denote labor, capital, and material

      (Proof is required).

            a) Q = 3L^0.5K^0.4 +1000L

             b) Q = 10K + 5L +1000

             c) Q = 10K^0.2L^0.3M^0.6