Question

in a class of 40 students 19 bought penclis 16 bought scales 4 students bought pencils and scales how many students doesn't bought pencil and scales

Answer 1

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total students = 40
students bought pencils = 19
students bought scales = 16 
students bought pencils and scales = 4
students who did not bought anything = 40 - (19+16+4)
                                                             = 40 - 39
                                                             = 1
therefore 1 student did not bought anything
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