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KEAM 2010 Math Paper
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© examsnet.com
Question : 77
Total: 120
The value of
1
√
10
−
√
9
−
1
√
11
−
√
10
+
1
√
12
−
√
11
−
.
.
.
−
1
√
121
−
√
120
is equal to
-10
11
14
13
-8
Validate
Solution:
We have
1
√
10
−
√
9
−
1
√
11
−
√
10
+
1
√
12
−
√
11
−
.
.
.
−
1
√
121
−
√
120
=
√
10
+
√
9
−
√
11
−
√
10
+
√
12
+
√
11
−
.
.
.
−
√
121
−
√
120
=
√
9
−
√
121
=
3
−
11
=
−
8
© examsnet.com
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