Factors of a number are those numbers which divide a number without leaving any remainder The factors of 65 are 1,5, 13,65 because all of these can divide 65 without leaving any remainder The factors of 70 are 1,2,5,7,10,14,35,70 since all of them can divide 70 without leaving any remainder The factors of 100 are 1,2,4,5,10,20,25,50,100 since all these can divide 100 without leaving any remaider
Let the event 'has cancer' be C, and the event 'works for Ajax' be A. P(C) = 0.0019. P(A) = 0.28 The events A and C are independent if P(C|A) = P(C). P(C|A) = 0.0019 = P(C). Therefore the answer is YES.