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this cannot be solved, as there is no pattern...
6; alternating decreasing series, by twos
3 4 5 6 The next number is 1 plus the previous number So the pattern rule is the next number is n + 1
10.1(+2) 3 (+3) 6 (+4) 10
The pattern is that for the first number, add 1. For the second number, subtract. Repeat to negative infinity. So the next number will be 3.