Do you know how to solve it because I can't see the problem
The correct answer is c (x-1)^2=8
A.0.8 < 5/6 < 12/13
because 5/6 = .83 and 12/13 = .92
There are 1,16,280 different recital programs possible.
Given: A pianist plans to play 4 pieces at a recital from her repertoire of 20 pieces and is carefully considering which song to play first, second, etc.
It means the repetition of pieces is not allowed.
When repetition is not allowed, then the number of ways to arrange n things where r things taken together is given by:-

Now, the number of different recital programs are:-

Hence, there are 1,16,280 different recital programs possible.
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If you do maths in the morning you are awake and concentrated whereas you could do it at night and be more likely to remember it the next day.