Interactive practice questions
Yuri has $5$5 blue marbles in a bag, along with $3$3 marbles of other colours.
Yuri picks a marble from the bag without looking.
What is the probability that Yuri picks a blue marble?
Easy
< 1min
A bag contains $21$21 red marbles and $26$26 blue marbles.
Easy
< 1min
A spinner has $5$5 sectors with a 
, $2$2 sectors with 
, and $3$3 sectors with a 
. All the sectors are the same size.
Easy
< 1min
A letter is chosen at random from the word COCOONS.
Easy
< 1min
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