Question

find an irrational number between 3/4 and 4/5

Answer 1

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Given :
$\red {\bold {\frac {3}{4} \: and \frac {4}{5}}}$

$\frac {3}{4} = \: 0.75 \\ \frac {4}{5} \: = 0.8$
So, irrational numbers between 0.75 and 0.8 are :-
0.757557555...
0.707007000...

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Answer 2

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-- :

3/4=15/20

4/5=16/20

15^2=225

16^2=256

So  √226/20,√227/20,√228/20,…,√255/20 are all irrational and in this range.