If a variable line, 3x + 4y – λ = 0 is such that the two circles x2 – McqOptions

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1.	If a variable line, 3x + 4y – λ = 0 is such that the two circles x2 + y2 – 2x – 2y + 1 = 0 and x2 + y2 – 18x - 2y + 78 = 0 are on its opposites sides, then the set of all values of λ is the interval
A.	[13, 23]
B.	(2, 17)
C.	[12, 21]
D.	(23, 31)
Answer» D. (23, 31)

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