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If a variable line 3x+4y-lamda=0 is such...

If a variable line `3x+4y-lamda=0` is such that the two circles `x^(2)+y^(2)-2x-2y+1=0 " and" x^(2)+y^(2)-18x-2y+78=0` are on its opposite sides, then the set of all values of `lamda` is the interval

A

(2,17)

B

[12,21]

C

[13,23]

D

(23,31)

Text Solution

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The correct Answer is:
B
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