The probability it does not happen

Difficulty Starter · Set mnd4ro

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

What is in this set

The numbers in this set run from 1 to 5.
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: 4 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 179 different ones, 75% — 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.