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RRB Group-D Model Paper 20 with answers for online practice
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© examsnet.com
Question : 48
Total: 100
Find the value of
√
42
−
√
42
−
√
42
−
…
…
…
…
.
6
5
4
3
Validate
Solution:
Let
√
42
−
√
42
−
√
42
−
…
…
…
…
.
=x
∴
√
42
−
√
42
−
√
42
−
…
…
…
…
.
=
√
42
−
x
∴x=
√
42
−
x
Squaring both sides,
x
2
=42−x
x
2
+7x−6x−42=0
x = -7, 6
Hence, 6 is the value of given expression as x cannot be negative.
© examsnet.com
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