A jar holds 15 red pencils and 10 blue pencils. What is the probability of drawing 2 red pencils from the jar?
1 Answer
Mar 9, 2016
Explanation:
Assuming ' non replacement '
total pencils = 15+10 = 25
probability of red on 1st draw
#= 15/25 = 3/5 # there are now 24 pencils , of which 14 are red.
probability of red on 2nd draw
# = 14/24 = 7/12# prob. of red ' and' red
#= 3/5 xx 7/12 = 21/60 = 7/20#
