odds against a winning game = probability of losing the game / probability of winning the game
probability of losing the game = 1 - 1/4 = 3/4
so
odd against winning = P(loose)/P(win)
= (3/4 )/(1/4) = 3/1
that is. 3 to 1
so option b is answer
8.2m questions
10.9m answers