ऊपर दिये चित्र में EC समान्तर है AB के, ...

ऊपर दिये चित्र में EC समान्तर है AB के, `angle`ECD=70 और `angle`BDO-`20^(@)` है। `angle`OBD किसके बराबर है ?

A

`20^@`

B

`30^@`

C

`40^@`

D

`50^@`

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