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The diagonals of a parallelogram A B C...

The diagonals of a parallelogram `A B C D` intersect at `O` . If `/_B O C=90^0\ a n d\ /_B D C=50^0,` then `/_O A B=` (a) `40^0` (b) `50^0` (c) `10^0` (d) `90^0`

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The correct Answer is:
`40^(@)`
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