Please help with letter c

IS (ii) 5th draw. (2 ) 1 2 ) = 10.04 Claudia plays the game when n = 6. She pays $11 to play and can earn money back depending on the number of draws it takes to obtain a green marble. She earns no money back if she obtains a green marble on her 5th draw. Let A be the amount of money that she earns back playing the game. This information is shown in the following table. Number of draws 2 3 4 5 Money earned back ($M) 15 AK 10 2k 0 (c) Find the value of & so that this is a fair game. 1/ 2 1 3 4 1 ( 15 ) + ( 4 K ) ( + 10) + 2k = 121 1/6