Bala kalula I-Intersection (A ∩ B) kanye Nenyunyana (A ∪ B) yamasethi amabili. Vele ufake izici ze-Setha A kanye ne-Setha B — thola imiphumela enemininingwane ngamafomula. Ilungele abafundi abafunda imisebenzi yesethi eyisisekelo ngendlela ejabulisayo, elula.