The probability it does not happen

Difficulty Stretch · Set 8gv7ne

Give each probability as a fraction in its lowest terms.

Fill in what you can and press Check. Nothing you type is sent anywhere.

1
A bag holds 4 black counters and 12 red ones. One is taken without looking. What is the probability that it is NOT black?
2
A bag holds 5 blue counters and 10 black ones. One is taken without looking. What is the probability that it is NOT blue?
3
A bag holds 8 green counters and 5 yellow ones. One is taken without looking. What is the probability that it is NOT green?
4
A bag holds 12 blue counters and 16 black ones. One is taken without looking. What is the probability that it is NOT blue?
5
A bag holds 7 green counters and 14 blue ones. One is taken without looking. What is the probability that it is NOT green?
6
A bag holds 14 red counters and 6 blue ones. One is taken without looking. What is the probability that it is NOT red?
7
A bag holds 7 red counters and 10 yellow ones. One is taken without looking. What is the probability that it is NOT red?
8
A bag holds 13 blue counters and 13 yellow ones. One is taken without looking. What is the probability that it is NOT blue?
9
A bag holds 5 black counters and 2 blue ones. One is taken without looking. What is the probability that it is NOT black?
10
A bag holds 8 black counters and 4 green ones. One is taken without looking. What is the probability that it is NOT black?
11
A bag holds 14 green counters and 16 yellow ones. One is taken without looking. What is the probability that it is NOT green?
12
A bag holds 1 red counter and 14 yellow ones. One is taken without looking. What is the probability that it is NOT red?
13
A bag holds 11 blue counters and 1 green one. One is taken without looking. What is the probability that it is NOT blue?
14
A bag holds 8 black counters and 15 green ones. One is taken without looking. What is the probability that it is NOT black?
15
A bag holds 14 blue counters and 2 green ones. One is taken without looking. What is the probability that it is NOT blue?
16
A bag holds 8 blue counters and 14 black ones. One is taken without looking. What is the probability that it is NOT blue?
17
A bag holds 9 yellow counters and 4 black ones. One is taken without looking. What is the probability that it is NOT yellow?
18
A bag holds 8 red counters and 10 blue ones. One is taken without looking. What is the probability that it is NOT red?
19
A bag holds 2 green counters and 14 red ones. One is taken without looking. What is the probability that it is NOT green?
20
A bag holds 4 blue counters and 6 red ones. One is taken without looking. What is the probability that it is NOT blue?

What is in this set

The numbers in this set run from 1 to 16.
Every problem in it will ask for the outcome that does not happen.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: 8 is the rest of the bag, not the whole of it.
Answers are a fraction in its lowest terms, written like 3/4.

Drawing 240 problems from this page produced 238 different ones, 99% — so a sheet of 20 is a new sheet almost every time.

The same skill, harder or easier

We would put this in front of a grade 6 class. That is our judgement, not a standard, and it is printed here so you can disagree with it. Everything else we put in that year.