Odd in favor = [tex]\frac{number \ of \ favorable \ outcomes}{number \ of \ unfavourable \ outcomes}[/tex]
Jamal writes the letters 'kansas' on the cards
There are two letters 's' and 4 letters that are not 's'
The number of favorable outcomes of picking an s = 2
The number of unfavorable outcomes of picking an s = 4
So odd in favor = [tex]\frac{2}{4} = \frac{1}{2}[/tex]