This is because probability is no. of favoured outcomes/total outcomes. For e.g:in a bag of total 5 balls having 2 red balls and 3 white balls, if a man picks up one randomly then what do you think most probably what colour he'll have?
White,isn't it? Because its probability is 3/5 and red has 2/5. White has more probability.
Same logic I've applied here.