ABCD is a cyclic quadrilateral. If the r...

ABCD is a cyclic quadrilateral. If the ratio of three consecutive angles of this quadrilateral be 5 : 6 : 7, the the ratio of the 1 st and 4th angle is

A

5 : 8

B

6 : 5

C

5 : 6

D

8 : 5.

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