According to the number provided, infer what number should be filled in the brackets? 0.1.3.6.10.15.21

1-0=1
3-1=2
6-3=3
10-6=4
15-10=5
21-15=6
The difference you want to reduce is 1,2,3,4,5,6
Then the last one is cut off, 21 is equal to 7
So () = 21 + 7 = 28

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