This is Statistics and probability subject.. please do provide precise solution please. no need for explain explain.... in return I WILL RATE HELPFUL RATING DIRECTLY..

2. There are 20 black cell phones and 30 white cell phones in a store. An employee takesl phones at random. Find the probability that: a. there will be exactly 4 black cell phones among the chosen phones: b. there will be less than 3 black cell phones among the chosen phones