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Thwre are 28 clients who don not play any of the instrument using the principle of Venn distribution.
Using a Venn diagram analogy :
From the information given :
The total number of clients can be related thus :
108 = 29 + 38 + 13 + None
108 = 80 + None
None = 108 - 80
None = 28
Therefore, the number of clients who do not play any of the instruments is 28
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