1 + 1 = 2
2 * 2 = 4
4 - 1 = 3
3 + 3 = 6
6 + 2 = 8
8 - 1 = 7
so you just repeat that .. meaning that the next number is 15
15
70. You just add 14 each time.
What number best completes the sequence 1 1/2 5 10 1/2 18
18
13 20 12
15.
15
Type your answer here... 15
17 19 20
15,30,32,31,62,64,63..... (*2,+2,-1)
15.
15 (times 2, plus 2, minus 1)