In a jar there are balls in different colors: blue, red, green and yellow.
The probability of drawing a blue ball is 1/4.
The probability of drawing a red ball is 1/5.
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 correct choice:
A) 9
B) 11
C) 10
D) 12
E) 17
answer of 1st   just add the given probabilities p(blue)+p(red)+p(green) i.e   1/4+1/5+1/10=11/20   now we know p(blue)+p(red)+p(green)+p(yellow)=1   11/20+p(yellow)=1   p(yellow)=9/20   i.e why yellow balls are 9.   9
<result>A</result>
In a jar there are balls in different colors: blue, red, green and yellow.
The probability of drawing a blue ball is 1/4.
The probability of drawing a red ball is 1/5.
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?