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10. 一、52
Please help!

User Ovanes
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1 Answer

2 votes

Answer:

31

Explanation:

There is the possibility that many numbers could be put in here. The simplest one is the average of 10 and 52

10 + 52 = 62

62 / 2 = 31

So the series becomes 10 31 52.

Add 21 to get the next term. So 52 + 21 = 73.

User Alex Kovshovik
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