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In the given figure , if angleBOC=7x+20^...

In the given figure , if `angleBOC=7x+20^(@)andangleCOA=3x` , then the value of x for which AOB becomes a straight line is :

A

`16^(@)`

B

`14^(@)`

C

`20^(@)`

D

`21^(@)`

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The correct Answer is:
A
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