there are 7 red balls and 5 blue balls in a jar . if 3 balls are selected from the jar , what is the probability that 3 balls selected are red balls ?
"probability = favorable outcomes / total outcomes probability = 7 c 3 / 12 c 3 or ( 7 / 12 ) * ( 6 / 11 ) * ( 5 / 10 ) = 7 / 55 answer option e"
divide(choose(5, 3), choose(add(7, 5), 3))