neelabhmahesh wrote:

OA is B. but how is tht??

Translate our problem to language of symbols

[x] - koala becomes extinct

not[x] - koala survives.

[p] - pace of forest disappearance

[pr] - present pace of forest disappearance“If the forest continues to disappear at its present pace, the koala will approach extinction,” said the biologist.

“So all that is needed to save the koala is to stop deforestation,” said the politician.

the biologist: if [p]>=[pr] then [x]

the politician: if [p]=0 then not[x]Which one of the following statements is consistent with the biologist’s claim but not with the politician’s claim?

the biologist: can be true

the politician: must be false(A) Deforestation continues and the koala becomes extinct:

[p]>0 (we don't know exactly a pace of deforestation) and not[x]:

the biologist: can be true;

the politician: can be true (B) Deforestation is stopped and the koala becomes extinct:

[p]=0 and [x]:

the biologist: can be true;

the politician: false (C) Reforestation begins and the koala survives:

[p]<0 and not[x]:

the biologist: can be true;

the politician: can be true(D) Deforestation is slowed and the koala survives:

[pr]>[p]>0 and not[x]:

the biologist: can be true;

the politician: true(E) Deforestation is slowed and the koala approaches extinction.

[pr]>[p]>0 and [x]:

the biologist: can be true;

the politician:can be true

Looks terrible but hope it help

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