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For a given system, number of variables is x and number of equations is y. What is the number of degrees of freedom?

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For a given system, number of variables is x and number of equations is y. What is the number of degrees of freedom?

(a) x + y

(b) x – y

(c) x * y

(d) x / y

The question was asked in exam.

My doubt is from Degrees of Freedom in division Humidity Charts and Analysis of the Degrees of Freedom in Steady-State Processes of Chemical Process Calculation

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Correct choice is (b) x – y

Easy explanation: Number of degrees of freedom = x – y.

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