To win a​ lottery, 7 numbers are drawn at random from a pool of 63 numbers. Numbers cannot repeat. If a person has one​ ticket, what is the probability that they have the winning​ ticket?

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.