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Every irrational number is:

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Surd

A prime number

Not a surd

None

answer is C.

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Detailed Solution

A surd is an irrational root of a rational number. For example

\sqrt{2}

is an irrational surd of rational number

2

.
Now, we have some irrational numbers like

π and e

, but they are not a surd. Thus, every irrational number is not a surd.
Hence, option 3 is the correct answer.

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