In-a-certain-urn-there-are-3-blue-2red-and-5-yellow-marbles-Calculate-probability-that-atmost-2-marbles-will-be-red-if-3-marbles-are-drawn-without-replacement-

Question Number 142489 by jlewis last updated on 01/Jun/21

In a certain urn there are 3 blue,

2 red and 5 yellow marbles .

Calculate probability that atmost

2 marbles will be red if 3 marbles

are drawn without replacement

Commented by mr W last updated on 01/Jun/21

a t m o s t 2 r e d m a r b l e s m e a n s :

n o r e d m a r b l e o r

o n e r e d m a r b l e o r

t w o r e d m a r b l e s .

t h a t m e a n s a l l p o s s i b i l i t i e s!

\Rightarrow p = 1

Commented by jlewis last updated on 02/Jun/21

please help, how does that

comes to be

Commented by mr W last updated on 02/Jun/21

w h e n y o u t a k e t h r e e m a r b l e s f r o m t h e

u r n, t h e r e a r e o n l y f o l l o w i n g c a s e s :

n o r e d m a r b l e

o n e r e d m a r b l e

t w o r e d m a r b l e s

s o t h e p r o b a b i l t y t h a t a t m o s t t w o

r e d m a r b l e s a r e t a k e n i t 100 % .

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