Which number should fill the blank

Can you fill the blank with the correct number?

6 30 870 756030 _____




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Shyla was sleeping in her apartment when suddenly a robber broke into her house. He asked her to stay quiet and started looting the cash and jewelry. Suddenly the landline phone started ringing. The robber pointed a gun at Shyla and asked her to pick up and talk without giving away the situation.

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10 minutes after, the police arrive at the scene and catch the robber. How did the police know about the robbery?

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