26june2019 paper1 Q16

16The proposition ‘No red is black’ is equivalent to which of the following propositions?
(i) No black is red
(ii) All red are black
(iii) Some red are not black
(iv) Red is not black
Select the correct answer from the options given below:

Option : C
Explanation : 'No red is black' is equivalent to
'No black is red' and this is equivalent to
'Red is not black'.
'All red are black' is negative proposition.
Hence, only conclusion (i) and (iv) are correct.

Forgot your password?

I agree with the Terms.