The number of students that played the piano and the flute but not the violin is 4 students.
The number of students that play the piano and the flute but not the violin is determined as follows:
Number of students that play all three instruments = 1
Number of students that could play the Piano and Flute = 5
Number of students that could play the Piano and Flute and not the Violin = 5 - 1
Number of students that could play the Piano and Flute and not the = 4
In conclusion, the number of students that play the Piano and Flute but not the Violin is obtained from subtracting the number of students that could play all three instruments from the Number of students that could play the Piano and Flute.
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