Find the sequence 1,3,6,11,20,37,?
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1 // our series starts with 1, we will use this 1 in next step
(1 * 2) + 1 = 3 // use this 3 in next step and so on..
(3 * 2) + 0 = 6
(6 * 2) - 1 = 11
(11 * 2) -2 = 20
(20 * 2) - 3 = 37 and so on..
(1 * 2) + 1 = 3 // use this 3 in next step and so on..
(3 * 2) + 0 = 6
(6 * 2) - 1 = 11
(11 * 2) -2 = 20
(20 * 2) - 3 = 37 and so on..
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1×2=3
3×2=6
6×2-1=11
11×2-2=20
20×2-3=37
37×2-4=70
3×2=6
6×2-1=11
11×2-2=20
20×2-3=37
37×2-4=70
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