What is the second difference that is used to replace the second order

1.	What is the second difference that is used to replace the second order derivate of y(t)?
A.	[y(n)-2y(n-1)+y(n-2)]/T
B.	[y(n)-2y(n-1)+y(n-2)]/T2
C.	[y(n)+2y(n-1)+y(n-2)]/T
D.	[y(n)+2y(n-1)+y(n-2)]/T2
Answer» C. [y(n)+2y(n-1)+y(n-2)]/T

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What is the second difference that is used to replace the second order derivate of y(t)?

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