1.

Prove that number ` log_(2)` 7 is an irrational number.

Answer» Let ` log_(2) 7 ` is a rational number. Then,
` log_(2)7=p/q , p,q in Q or 7 = 2^(p//q) or 7^(q) = 2^(p)`
which is not possible for any integral values of p and q.
Hence, ` log_(2) 7 ` is not rational.


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