The pattern is that each number equals to one tenth of the number before it. The number that will come next will be one tenth of 10, which is 1.
18. The pattern is add 5, then subtract 1.
The pattern 1, 10, 100, 1000 next four numbers would be 10000, 100000, 1000000, 10000000.
217
20
1
The pattern is +5, -7... the answer is 6
The pattern is that each number equals to one tenth of the number before it. The number that will come next will be one tenth of 10, which is 1.
18. The pattern is add 5, then subtract 1.
6; alternating decreasing series, by twos
10.1(+2) 3 (+3) 6 (+4) 10
6100
7 is the next number in the pattern
2
12
2310.
256