Arithmetic 36901

The examiner has prepared 20 examples from arithmetic. He wants to choose seven samples for the paper. The order of the examples does not matter. How many different papers can he compile?

Correct answer:

n =  77520

Step-by-step explanation:

C7(20)=(720)=7!(207)!20!=765432120191817161514=77520  n=(720)=77520

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