Initially a box contained 6 blue pens, 8 black pens and 3 red pens.
You blindly picked up a pen.
(a) What is the probability that it was a blue pen?

Later some additional blue pens were put in the box.
The probability of selecting a blue pen became then 50%.

(b) How many blue pens were added to the box?

(a) 6/17

Edited on March 18, 2024, 11:22 am

Posted by K Sengupta on 2024-03-18 10:37:24