Which number should fill the blank

Can you fill the blank with the correct number?

6 30 870 756030 _____




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The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

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There are five people. One of them shot and killed one of the other five.
We know following clues:
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Do You See It?

Do You See It?

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