Okay ben is playing a game there are 4 difficulties the easiest difficultie is easy and you can earn two items item a and item b , on each difficulty there is a certain chance too get the items a and b item A on easiest difficulty is 40 percent chance however there is only a 4 percent chance too get item B

on the second difficulty which is normal diffuclty its a 50 percent chance for ben too get Item A and Item B is 6 percent

in Hard diffuclty 60 percent chance for item A and for item B its 10 percent chance

and for the hardest difficulty item A is 70 percent and for Item B its 15 percent

Out of all 4 difficulties which has a more likely chance too get item B ?

and the difficulty you chose around how many times would ben need too do that difficulty repeatedly too guarantee he gets item b ?