In The Below question , two statements are followed by two conclusions numbered I and II. You have to take the two given statements to be true even if they seem to be at variance with commonly known facts and then decide which of the given conclusions logically follows from the given statements , disregarding commonly known facts.
Statements : All rivers are lakes. all lakes are oceans.
Conclusions: I. All rivers are oceans
II. At least some one oceans are lakes.
A.Only conclusion II follows B. Only conclusion I follows C. Only conclusion I nor II follows D.Both Conclusions I and II follows E.Only conclusion I or II

• Ans: D
  All rivers are lakes. all lakes are oceans
  SO easily say thah all rivers are oceans and all oceans are lakes
  
• 11 years agoHelpfull: Yes(3) No(0)
• option D.
  using tick cross method, we will get 3 restatements.
  they are,
  1.All rivers are oceans
  2.some rivers are oceans
  3.some oceans are rivers
• 11 years agoHelpfull: Yes(1) No(1)
• u can also do it by ven's diagram
• 11 years agoHelpfull: Yes(0) No(0)
• River comes under Lake . Lake comes under oceans
  
  R
• 10 years agoHelpfull: Yes(0) No(0)
• B) only conclusion I follows
  ((All=>some , somesome , nono , all+all=all))
  statement I can be:-some rivers are lakes X
  statement II:- some lakes are oceans X
  deducting I & II:-all rivers are oceans
  
• 9 years agoHelpfull: Yes(0) No(0)
• Ans. is D. Both Conclusions I and II follows.
  
  
• 9 years agoHelpfull: Yes(0) No(0)
• D is answer
• 7 years agoHelpfull: Yes(0) No(0)