Bill wants to see how many times he needs to roll a standard number cube before getting a 5. what is the probability that bill will roll a 5 on his third roll and not before?

a. 125/1296
b. 25/216
c. 1/6
d. 1/2

The answer is b. 25/216

Step-by-step explanation:

Bill wants to see how many times he needs to roll a standard number cube before getting a 5.

p = (on an average: roll 6 times before getting a 5)

The required probability can be found as :

=

=

So, the answer is b. 25/216

after abc its efg

step-by-step explanation:

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.