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Question

You can answer any 18 questions from a total of 20 questions on an exam. In how many different ways can you select the questions?

Solution

VerifiedAnswered 2 years ago

Answered 2 years ago

Step 1

1 of 3To solve for the combination of elements taken at a time, follow the steps below

- determine the value of $n$ and $r$
- substitute the values to the equation $_nC_r=\dfrac{n!}{(n-r)!r!}$

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