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Consider the following statements: m = Edna is respectful n = Edna is brilliant, If...

Mathematics
WAEC 2024

Consider the following statements:

m = Edna is respectful

n = Edna is brilliant,

If m ⇒ n, which of the following is valid? 

  • A. ¬n ⇒ ¬m.
  • B. ¬m ⇒ ¬n.
  • C. n ⇒ ¬m.
  • D. m ⇒ n.
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Correct Answer: Option A
Explanation

Given: m: Edna is respectful, n: Edna is brilliant

From the implication  m ⇒ n:

a) Contra-positive: If Edna is not brilliant (¬n), then she is not respectful (¬m): ¬n ⇒ ¬m

b) Direct: If Edna is respectful (m), then she is brilliant (n)

c) Invalid: If Edna is brilliant (n), we cannot conclude she is respectful (m)

Thus, the valid conclusion is: ¬n ⇒ ¬m.


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