Question

Candidates were asked to come to an interview with 3 pens each. black, blue, green and red were the permitted pen colours that the candidate could bring. the probability that a candidate comes with all 3 pens having the same colour is

Answer 1

According to question

Number of pens to bring by each candidate   = 3 Pens
Total Number of Colours of Pens  = 4 Colour

Thus

The probability that three pens are of same colour

Probability =  3C1 / 4C3
                   = 3 / 4
Thus The probability is 34