the question below some statements are given followed by three conclusions I, II, and III. You have to take the given statements to be true even if they seem to be at variance with commonly known facts. Read all the conclusions and then decide which of the given conclusion definitely follows from the given statements, disregarding commonly known facts.
Statements:
No Quick is Quiet.
No Quiet is Push.
All Quiet is Pull.
Conclusions:
I. Some Pull is Push.
II. Some Push is not Pull.
III. No Quick is Push.
No Quiet is Push (E) → Conversion → No Push is Quiet (E) + All Quiet is Pull (A) → Some Pull is not Push (O*). Hence neither conclusion I nor II follow. No Quick is Quiet (E) + No Quiet is Push (E) → No conclusion. Hence conclusion III does not follow.
If n(A) = 25, n(B) = 40 and n(A ∪ B) = 50, then n(A ∩ B) equals
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