Respuesta :

bcalle
a)  Y U Z { B, C, D, F, G, H, K, T, L, M, N, W}
b)  n(YUZ) {5}    (n is the number of elements in the set)
c)  X AND Y {K}
d)  n(X AND Y) {16}

I'm not sure of that notation for e and f. Can you tell me what the X\Y means?