We will be using the fact that 
, where 
is the probability that the first bulb works and 
is the probability that the second bulb works.
The probability that the first bulb works is 
. However, when we take one out (given that the first bulb works) we now have 19 working bulbs and 4 bad ones. This means that the probability that the second bulb works is 
.
Now, we can find our final probability:
Answer:
b1 = (28/h) -b2
Step-by-step explanation:
Filling in the given value for A, you have ...
14 = (1/2)(b1 +b2)h
Multiply by 2/h:
28/h = b1 +b2
Subtract b2:
b1 = (28/h) -b2
Answer:
(3,8)
Step-by-step explanation:
110/11 is essentially 110 divided by 11. Therefore, 110 divided by 11 is 10/1, which equals 10.
Answer:
5
Step-by-step explanation:
Subtract 1 from both sides. The equation becomes 2.5d + 6.25 = 3.75d
Subtract 2.5d from both sides. The equation becomes 6.25 = 1.25d
Divide 1.25 from both sides. You get 5 = d
