Maths-
General
Easy
Question
The entries in a two-by-two determinant are integers that are chosen randomly and independently, and, for each entry, the probability that the entry is odd is p. If the probability that the value of the determinant is even is 1/ 2, then the value of p, is
Hint:
Whenever an event is the complement of another event, specifically, if A is an event, then P(not A) = 1 - P(A) or P(A') = 1 - P(A).
P(A) + P(A′) = 1.
The correct answer is:
Given = is a two-by-two determinant
and , probability that the value of the determinant is even { P (even) } is 1/ 2
Detailed Solution
Probability that the value of the determinant is odd { P (odd) } is
= ad - bc is odd when ad is odd and bc is even and vice versa
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