In a jar there are balls in different colors: blue, red, green and yellow.
The probability of drawing a blue ball is 1/8.
The probability of drawing a red ball is 3/5.
The probability of drawing a green ball is 1/10.
If a jar cannot contain more than 50 balls, how many yellow balls are in the Jar?
Choose the most appropriate option:
A) 33  B) 7  C) 14  D) 21  E) 9
answer of 1st   just add the given probabilities p(blue)+p(red)+p(green) i.e   1/8+3/5+1/10=5+24+4/40 =33/40   now we know p(blue)+p(red)+p(green)+p(yellow)=1   33/40+p(yellow)=1   p(yellow)=7/40   i.e why yellow balls are 7.   7
<result>B</result>
In a jar there are balls in different colors: blue, red, green and yellow.
The probability of drawing a blue ball is 1/8.
The probability of drawing a red ball is 3/5.
The probability of drawing a green ball is 1/10.
If a jar cannot contain more than 50 balls, how many yellow balls are in the Jar?