What is your answer?

As an empiricist, Ayer holds that all factual knowledge is based on sense experience.

Some philosophers object that "2+2=4" is a factual truth that we know but don't base on sense experience. In response, Ayer says that "2+2=4"

    { 1 } - isn't true.
    { 2 } - isn't known (since it's very uncertain).
    { 3 } - is based on sense experience.
    { 4 } - isn't a factual truth (a truth about the world).

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1 is wrong. Please try again.

As an empiricist, Ayer holds that all factual knowledge is based on sense experience.

Some philosophers object that "2+2=4" is a factual truth that we know but don't base on sense experience. In response, Ayer says that "2+2=4"

He thinks "2+2=4" IS true.

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2 is wrong. Please try again.

As an empiricist, Ayer holds that all factual knowledge is based on sense experience.

Some philosophers object that "2+2=4" is a factual truth that we know but don't base on sense experience. In response, Ayer says that "2+2=4"

    { 1 } - isn't true.
    { 2 } - isn't known (since it's very uncertain).
    { 3 } - is based on sense experience.
    { 4 } - isn't a factual truth (a truth about the world).

He thinks "2+2=4" IS known with certitude.

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3 is wrong. Please try again.

As an empiricist, Ayer holds that all factual knowledge is based on sense experience.

Some philosophers object that "2+2=4" is a factual truth that we know but don't base on sense experience. In response, Ayer says that "2+2=4"

    { 1 } - isn't true.
    { 2 } - isn't known (since it's very uncertain).
    { 3 } - is based on sense experience.
    { 4 } - isn't a factual truth (a truth about the world).

He thinks "2+2=4" holds independently of sense experience -- since no sense experience could show it to be false.

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4 is correct!

As an empiricist, Ayer holds that all factual knowledge is based on sense experience.

Some philosophers object that "2+2=4" is a factual truth that we know but don't base on sense experience. In response, Ayer says that "2+2=4"

    { 1 } - isn't true.
    { 2 } - isn't known (since it's very uncertain).
    { 3 } - is based on sense experience.
    { 4 } - isn't a factual truth (a truth about the world).

He says "2+2=4" is true by convention -- it's true because of how we use words. It's an analytic statement, like "All bachelors are single." As a verbal truth, it can be known with certitude but doesn't say anything about the world.

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