RRB Group D 17-Dec-2018 Shift 1 Soled Paper

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Question : 18 of 100

Marks: +1, -0

Which of the following is a rational number?

$√^4{81}$
$√^4{36}$
$√^4{49}$
$√^4{64}$

Solution:

√^4{81}=√{3×3×3×3}=4→

Rational

√^4{36}=√^4{2×2×3×3}=√^4{36}→

Irrational

√^4{49}=√^4{7×7}=√^4{49}→

Irrational

√^4{64}=√^4{2×2×2×2×2×2}=2√^4{2×2}

→Irrational

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