If each letter in the sums below represents a different positive integer, then c= a+b+c=7 c+d+e=9 A) 1 B) 2 C) 3 D) 4 Please include an explanation, especially if you know how to solve this without doing backsolving (trying out the answer choices)

the answer   is 200

step-by-step explanation:

this is a problem about poisson probabilities.   i don't know if you've

already studied poisson distributions, or if you have a place to look

to read more about the subject.  

here's how you can see a poisson distribution coming.   when there are

a lot of events that may happen at any time (or any place), and when

you're counting how many of them happen at a particular time (or a

particular place), and each event is independent of the others, then

the result is a poisson distribution.   this is roughly true for the

chocolate chips; one chip being in a cookie has only a small effect on

the probability that another chip will be in the cookie.

once you know you have a poisson distribution, you know a lot.   there

is only one parameter to a poisson distribution, so if you know the

mean, you know everything.   the form of the distribution is

  probability of n chips = {[e^(-x)]*(x^n)} / (n! )

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.

days of the week

step-by-step explanation:

javier earned more money then kyle, so that won't always be a constant term, but the days of the week do not change so that term is always constant.

edit: i meant

eww xbox also eww dayz

step-by-step explanation:

just for that im not answering