500
25-1=24 24-2=22 22-3=19 19-4=15 15-5=10 The next number in the series is 10.
18
20
12
14
The next number in the series 1 2 4 8 10 20 22 is
550
25-1=24 24-2=22 22-3=19 19-4=15 15-5=10 The next number in the series is 10.
20
18
39
20
12
20
Hi
20
22