Question

In a cardboard box I have 37 red pens, 120 black pens and 43 blue pens. If one pen is chosen at random, find the probability that the pen is either red, black or blue.​

Answer 1

Answer:

Total Blue Pens: 4

Total Red Pens: 2

Total Black Pens: 3

Total Pens: 4+2+3=9

Probability of drawing 2 blue pens =

9

C

2

4

C

2

=

9×8

4×3

=

6

1

After this, the pens are not replaced, which reduces the number of pens in the pack to 7.

So, the probability of drawing 1 black pen from a pack of 7 pens would be

7

C

1

3

C

1

=

7

3

Probability of drawing 2 blue pens and 1 black pen =

6

1

×

7

3

=

14

1

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Answer 2

Step-by-step explanation:

1/200

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