Relationship between the number of links (L) and number of pairs (P)

1.	Relationship between the number of links (L) and number of pairs (P) is
A.	P = 2L - 4
B.	P = 2L + 4
C.	P = 2L + 2
D.	P = 2L - 2
Answer» D. P = 2L - 2

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Relationship between the number of links (L) and number of pairs (P) is

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