5. Which of the following is irrational number--
(a) √4/√9
(b) 4/5
(C) √7
(d) √81
With solution
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5. Which of the following is irrational number--
(a) √4/√9
(b) 4/5
(C) √7
(d) √81
With solution
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ANSWER:-
(c). √7
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explanation:-
(a) (√4)/(√9) -------✖
= 2/3. (rational)
(hence it is in the form of p/q and also p and q hcf is 1 so it is rational number)
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(b) 4/5---------✖
(it is in the form of p/q and the hcf of p and q is 1 so it is rational number)
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(c) √7 tm
its an irrational number
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(d) √81 ------------✖
= 9
hence, its a rational number
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C) is correct option
Hope it helps you