, En is said to represent a partition of the sample space S if
(a) Ei ∩ Ej = φ, i ≠ j, i, j = 1, 2, 3, , n
© NCERT
not to be republished
PROBABILITY      549
Fig 13 4
(b) E1 ∪ Ε2 ∪ ∪ En= S and
(c) P(Ei) > 0 for all i = 1, 2,