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Conditional Probability

In the given ...

Question

In the given figure, the points A, B, C, D are concyclic, when x=70,y = ?

A

70

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B

110

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C

120

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D

80

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Solution

The correct option is B 110
If Quadrilateral ABCD is concyclic
Then,
Sum of opposites angles is $180$
$∴ x + y = 180$
$=> y = 180 - 70$
$=> y = 110$

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