Asked by nandhu
in a bag there are 20 red 30black 40 blue50 white balls. what is the minimum number of balls to be drawn without replacement so that you are certsin about getting 4 red,5 black,6 blue,7 white balls
Answers
Answered by
MathMate
Red is the hardest to get, since there are only 20 of them.
To make sure you get <i>some</i> red, the worst case is you picked all the black, blue and whites (totalling 120) and still not get a red.
What is the minimum you need?
To make sure you get <i>some</i> red, the worst case is you picked all the black, blue and whites (totalling 120) and still not get a red.
What is the minimum you need?
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