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For a reboiler stage N, the middle diagonal is

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For a reboiler stage N, the middle diagonal is

(a) -(1+L1/KI1D)

(b) KIf and LiF

(c) L1/KI1D

(d) -(1+B1/KI1VN)

The question was asked in an online interview.

The origin of the question is Tridiagonal Matrix Method for Material Balances in portion Rigorous Distillation Calculations of Distillation Design

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Correct choice is (d) -(1+B1/KI1VN)

Easiest explanation: For a reboiler stage N the middle diagonal is-(1+B1/KI1VN), -(1+L1/KI1D) represents  the next set of absorption factor of next + 1 stages.

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