musical piece problem 164

Mathematics
Tutor: None Selected Time limit: 1 Day

For the orchestra contest, Mrs. Treble is going to collect 4 pieces of music from the recommended list of 20 pieces. How many combinations of 4 pieces of music are possible?

Aug 19th, 2014

Number of combinations =20C4 = 20*19*18*17/(4*3*2*1)= 5*19*3*17=4845 

Aug 19th, 2014

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Aug 19th, 2014
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Aug 19th, 2014
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