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In a quadrilateral A B C D ,\ /A+/C is 2...

In a quadrilateral `A B C D ,\ /_A+/_C` is 2 times `/_B+/_Ddot` If `/_A=140^0\ a n d\ /_D=60^0,` then `/_B=`

A

(a) `60^0`

B

(b) `80^0`

C

(c) `120^0`

D

(d) None of these

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