Oh honey, that pattern is like a rollercoaster ride. It's just alternating between adding 1 and subtracting 1. So, you start with 1, add 9, then add 1, subtract 7, add 3. It's like a math puzzle trying to keep you on your toes.
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It is 1 9 2 8 3 7 4 6 5 5 : 1 + 9 = 10 2 + 8 = 10 3 + ? = 10 ----> 3 + 7 = 10
1 10 2 9 3 8 4 7 5 6 6 5 7 4 8 3 9 2 10 1
divide by 2 and add 1
1+2+3+4 = 10 ---------------------- For this question there is actually a whole lot of answers... for example: ((1 + 2) + 3) + 4 = 10 ((1 × 2) × 3) + 4 = 10 (1 + 2) + (3 + 4) = 10 1 + (2 + 3) + 4 = 10 1 × (2 × 3) + 4 = 10 1 + ((2 + 3) + 4) = 10 1 × ((2 × 3) + 4) = 10 1 + (2 + (3 + 4)) = 10 ((1 + 2) + 4) + 3 = 10 (1 + 2) + (4 + 3) = 10 So Manny Diffrent way's you can use four numbers to equal 10.
It is 7