This question was previously asked in

ALP CBT 2 Physics and Maths Previous Paper 5 (Held On: 22 Jan 2019 Shift 2)

Option 1 : 1 / 20

RRB ALP 2018 Full Test (Stage II - Part A)

119128

100 Questions
100 Marks
90 Mins

**Given:**

19 defective pen

361 good pen

**Concept used:**

Probability = (favourable numbers of observation) /(Total numbers of observations)

**Calculation:**

Total number of pen = 361 + 19 = 380

Probability of taking out defective pen = favourable number of ways to take out defective pen / total number of outcome

Number of favourable ways to take out defective pen = 19

Total number of outcome = 380

⇒ Probability of taking out defective pen = 19 / 380 = 1/20

**∴ The probability of taking out the defective pen is 1/20**