In given questions, examine the given statements carefully and find out which two of the statement can not be true simultaneously, but can both be false.
Examine the following statements regarding a set of balls:
(a) All balls are black.
(b) All balls are white
(c) Only some balls are black.
(d) No balls are black.
Assuming that the balls can only be black or white, which of the two statement given above can both be true, but cannot both be false ?

Options

A. 1 and 3
B. 1 and 4
C. 2 and 3
D. 2 and 4

Answer

B