Logic Puzzles

Likely answers:

15 is odd, because the others fit a cleaner pattern:
1, 5, 9, 13, 25, 37, 49 would mostly follow adding 4, 4, 4, 12, 12, 12.
So 15 should probably be 13.

46 is odd.
The differences should halve each time:

445 - 221 = 224
221 - 109 = 112
109 - 53 = 56
53 - 25 = 28
25 - 11 = 14
11 - 4 = 7

So 46 should be 53.

9 is odd.
Split into alternating sequences:

Odd positions: 3, 8, 13, 18, 23, adding 5 each time.
Even positions should be: 2, 12, 22, 32, 42, adding 10 each time.

So 9 should be 12.

Final: 15, 46, 9.