The number of chips. So if there are 3 defects in 7 chips... Some specific chip has the first defect. The odds that it has the 2nd defect are 1 in 7 The

The number of chips. So if there are 3 defects in 7 chips... Some specific chip has the first defect. The odds that it has the 2nd defect are 1 in 7 The odds that it also has the 3rd defect are 1 in 7 squared. Which equals 0.020408....