math
posted by Mahalakshmi .
A bucket contains 7 red, 3 blue, 2 black and 1 yellow ball of the same size.
A random selection of 5 balls is taken from the bucket.
find the probability that the random selection will contain atleast 1 red ball?

pr(1 or more red)=1pr(no red)
= 1(6/13)(5/12)(4/11)(3/10)(2/9)