What is the expression for the perturbation error pi? – McqOptions

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1.	What is the expression for the perturbation error pi?
A.	( sum_{k=1}^N frac{ p_i}{ a_k} Delta a_k )
B.	( sum_{k=1}^N p_i Delta a_k )
C.	( sum_{k=1}^N Delta a_k )
D.	None of the mentioned
Answer» B. ( sum_{k=1}^N p_i Delta a_k )

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