20
alternate numbers and double difference
6 / 8 / 12 = +2 / +4 / so +8 next = 12 + 8 = 20
(3 / 4 / 6 / 10 = +1 / +2 / +4 / so same again = 10 + 8 = 18
3 6 4 8 6 12 10 20 18 36 34 68 66
12
The number that comes next in the series 1 2 2 5 3 10 is 7. You get this number by subtracting the number 3 from the number 10.
11 comes next.
48
36
36
48
456789
12
212.
20 alternate numbers and double difference 6 / 8 / 12 = +2 / +4 / so +8 next = 12 + 8 = 20 (3 / 4 / 6 / 10 = +1 / +2 / +4 / so same again = 10 + 8 = 18 3 6 4 8 6 12 10 20 18 36 34 68 66
36