A box contains four green marbles eight blue marbles and three orange marbles. without looking, what is the probability that the first two picked will both be green?
1 Answer
Feb 1, 2016
# 2/35#
Explanation:
Total marbles = 4+8+3 = 15 of which 4 are green.
# P(green) = 4/15 # Assuming there is no replacement.
If a green was picked there are now 3 green left and 14 marbles.
P( 2nd green)
# = 3/14# P ( both green)
# = 4/15 xx 3/14 = 2/35 #
