Question

In a bottle there are 7 red buttons,5 green buttons and 8 purple buttons .what is the probably that randomly drawn button from the bottle is a purple button? If one extra green button is put in side the bottle,what will be the probability that randomly drawn button is purple?

Answer 1

probability of getting a purple bottle is
$8 \div 20$
i.e
$4 \div 5$
after adding a green bottle probability is
$8 \div 21$
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Answer 2

Answer:

IN CASE 1 :

Total no. of buttons = 7+5+8 = 20

P = favourable no. of outcomes

______________________

total no of outcomes

P = 8/20

= 2/5

IN CASE 2 :

Total no of buttons adding one extra green button = 7+6+8 = 21 ( because 5+1 = 6 )

P = 8/21

thank you

xd.