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Mathematics, 13.12.2020 06:50 JamesLachoneus

De 340 personas encuestadas para saber si tienen smartphone, laptop o tablet, 263 tienen smartphone, 228 tienen laptop,49 tienen tablet, 198 tienen smartphone y laptop, 20 tienen smartphone y tablet,
12 tienen laptop y tablety 4 tienen los 3 dispositivos.
a) ¿Cuántas personas no tienen ninguno de los dispositivos?
b) ¿Cuántos solo tienen laptop?
c) ¿Cuántos tienen smartphone y tablet, pero no laptop?

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