Which of these time-steps are used to approximate the value at time-st – McqOptions

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1.	Which of these time-steps are used to approximate the value at time-step t- ( frac{ Delta t}{2} ) using the Crank-Nicolson scheme for finite volume approach?
A.	t and t+ t
B.	t and t- t
C.	t and t- ( frac{ Delta t}{2} )
D.	t and t+ ( frac{ Delta t}{2} )
Answer» C. t and t- ( frac{ Delta t}{2} )

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