Fred buys a video game disk for 4$. there was a discount of 20%. what is the sales price?
2 answers:
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Question 1
There are 5 letters (B, O, K, E, R) and there is a total of 10 letters to make up the word.
There are
ways of arranging the letters, which equal to 210 ways
Question 2
There are seven swimmers in total.
There are
ways of choosing the first winner, which is 7 ways
There are
ways of choosing the second winner, which is 6 ways
There are
ways of choosing the third winner, which is 5 ways
There are 7×6×5=210 ways of choosing first, second, and third winner
Question 3
The probability of eating an orange and a red candy is
×
, which equals to 
The probability of eating two green candies is
×
which equals to 
There are 5 letters (B, O, K, E, R) and there is a total of 10 letters to make up the word.
There are
Question 2
There are seven swimmers in total.
There are
There are
There are
There are 7×6×5=210 ways of choosing first, second, and third winner
Question 3
The probability of eating an orange and a red candy is
The probability of eating two green candies is