Question

a desk drawer contains 5 red pens, 6 blue pens, 3 black pens, 24 silver paper clips and 16 white if you select a pen and paper at random what is the probablity that you select a black pen and white paper clip

Answer 1

1/5

Explanation:

The sample space for pens is

5 red pens, 6 blue pens, 3 black pens,(5+6+3)= 14pens

The sample space for paper is

4 silver paper clips and 16 white (4+16)=20 papers

The probability of selecting a black pen and white paper

Pr(black pen)*Pr(white paper)

=3/14*16/20

=48/280

= 14/70

= 2/10

= 1/5