1:3, 9:28, 4:12, 2:6, 6:18 which one is the odd one out?

Is the product of seventeen negative numbers, positive or negative ?

Ican figure out 20 shares multiply by $117.98 =2359.6920 shares multiply by $124.32=2486.40then take 40 shares multiply by $128.48=5139.20after that i'm lost any be greatly appreciated.

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?