Interactive practice questions
A jeweller has arranged his gems based on the cut and colour of the gem:
Cuts - triangular 
, rectangular 
, and octagonal 
Colours - amethysts 
, emeralds 
, and rubies 
a
How many of the gems are not rubies?
b
How many of the gems are both ruby and triangular?
c
How many of the gems are rubies that aren't triangular?
Easy
< 1min
A jeweller has arranged his gems based on the cut and colour of the gem:
Cuts - triangular , rectangular , and octagonal
Colours - amethysts , emeralds , and rubies
Easy
< 1min
A group of students were asked about their siblings. The two categories show if they have at least one brother, and if they have at least one sister.
Easy
1min
A student creates the following diagram of their favourite animals.
Easy
< 1min
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