Probability 1st song is sung by female : 55/100 reduces to 11/20 probability 2nd song is sung by a male : 35/100 reduces to 7/20 probability 3rd song is instrumental : 10/100 reduces to 1/10
probability of all 3 events happening : 11/20 * 7/20 * 1/10 = 77/4000
