In a parallelogram A B C D, if ∠ D A B=75^∘ and ∠ D B C=60^∘, then ∠ B D C= (a) 75^∘ (b) 60^∘ (c)...

In a parallelogram A B C D, if ∠ D A B=75^∘ and ∠ D B C=60^∘, then ∠ B D C=
(a) 75^∘
(b) 60^∘
(c) 45^∘
(d) 55^∘
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