Question

There are 40 pieces of building blocks in a bag: 10 each of blue, green, red, and yellow. Two pieces are chosen at random. Identify the probability that both of the pieces chosen are green. ?

Answer 1

`3/52`

Explanation:

P(green)=`10/40`
When choosing the second block the P(green)=`9/39`

This means the P(GG)=`10/40xx9/39`

`=90/1560=9/156=3/52`