Which of the following code extracts 1st element of the 2nd element? – McqOptions

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1.	Which of the following code extracts 1st element of the 2nd element?
A.	x[[c(2, 1)]]
B.	x[[c(1, 2)]]
C.	x[[c(2, 1,1)]]
D.	x[[(2, 2,1)]] View Answer
Answer» B. x[[c(1, 2)]]

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