15 The sequence seems to be x2, +2, -1.
18
15.
15
15,30,32,31,62,64,63..... (*2,+2,-1)
Type your answer here... 15
17 19 20
a,b,c,d = 1,2,4,3 b=2a c=b+2 d=c-1 7*2=14 14+2=16 16-1=15
15 (times 2, plus 2, minus 1)
What number best completes the sequence 1 1/2 5 10 1/2 18
1. double 2. add two 3. subtract one 4. repeat 1 to 3
x 2 + 2 - 1 is the repeating sequence 1 x 2 = 2 2 + 2 = 4 4 - 1 = 3 3 x 2 = 6 6 + 2 = 8 8 - 1 = 7 7 x 2 = 14 14 + 2 = 16 16 - 1 = 15 the next number is 15