In the given figure, A O B is a straight line. If ∠ A O C=4 x^∘ and ∠ B O C=5 x^∘ then ∠ A O C= ?...

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In the given figure, A O B is a straight line. If ∠ A O C=4 x^∘ and ∠ B O C=5 x^∘ then ∠ A O C= ?
(a) 40^∘
(b) 60^∘
(c) 80^∘
(d) 100^∘

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