Ajar contains 100 marbles. there are 10 blue marbles, 79 green marbles, 6 red marbles, and 5 yellow marbles. what is the probability of randomly selecting a blue marble?

To find the probability of pulling something first take note of the total number and the amount of which you want to select.

100 and 10

Now set them up as a fraction

10/100 and simplify

1/10 or 10%

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb