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If A and B are any two events such that P(A) + P(B) – P(A and B) = P(A), then
It is given in the question that,
A and B are any two events where,
P (A) + P (B) – P (A and B) = P (A)
∴
= 1
Hence, option B is correct
Suppose we have four boxes A, B, C and D containing coloured marbles as given below:
Box | Marble colour | ||
Red | White | Black | |
A | 1 | 6 | 3 |
B | 6 | 2 | 2 |
C | 8 | 1 | 1 |
D | 0 | 6 | 4 |
One of the boxes has been selected at random and a single marble is drawn from it. If the marble is red, what is the probability that it was drawn from box A?, box B?, box C?