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In a group of 26 pupils, 3 play the flute only. 5 play the piano only. 
7 play neither instrument. 
How many pupils play both instruments?

 Jul 8, 2021
 #1
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would it not just be 26-3-7-5

=11

 Jul 8, 2021
 #2
avatar+33620 
+2

Here is a Venn diagram:     Looks like 11    ( as P4 found ! ) 

 

 Jul 8, 2021

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