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RRB Group D 17-Dec-2018 Shift 1 Soled Paper
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© examsnet.com
Question : 18
Total: 100
Which of the following is a rational number?
4
√
81
4
√
36
4
√
49
4
√
64
Validate
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
© examsnet.com
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