(03.01) the domain of the following relation r {(6, −2), (1, 2), (−3, −4), (−3, 2)} is 1 {−3, −3, 1, 6} 2 {−4, −2, 2, 2}

3 {−4, −2, 2} 4 {−3, 1, 6}

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?