Question

A bag contain 5 white , 7 red,5 black and 4 green balls. If a ball is drawn at random from the bag. What is the probability that the ball is not black ​

Answer 1

Answer:

When the ball drawn is red or white when there are 7 red, 5 white and 3 black balls. 7 + 5 = 12 and the total number of outcomes is 7 + 5 + 3 = 15. Probability that the ball drawn is red is Number offavorableoutcomesTotal numberofoutcomes=1215=45 .

Answer 2

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☘️ A bag contain 5 white , 7 red,5 black and 4 green balls. If a ball is drawn at random from the bag. What is the probability that the ball is not black .

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$\Large\bf{\color{cyan}GiVeN,}$

• A bag contain 5 white, 7 red, 5 black and 4 green balls.

$\longmapsto\:\:\rm{Total\:no.\:of\:balls\:=\:5\:+\:7\:+\:5\:+\:4\:}$

$\longmapsto\:\:\bf{Total\:no.\:of\:balls\:=\:21\:}$

$\red\checkmark\:\:\bf{Total\:no.\:of\:black\:ball\:=\:5\:}$

$\green\checkmark\:\:\bf{Total\:no.\:of\:nonblack\:ball\:=\:21\:-\:5\:=\:16}$

$\Large\bf{\color{pink}We\: know\:that,}$

$\red\bigstar\:\:\bf\purple{Probability\:=\:\dfrac{No.\:of\: favourable\: outcomes}{Total\:no.\:of\: outcomes}\:}$

$\Large\bf{\color{indigo}So,}$

$\longmapsto\:\:\bf\orange{P\:(not\: black\:ball)\:=\:\dfrac{16}{21}\:}$