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COMEDK Exam 2014 Solved Paper
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© examsiri.com
Question :
177 of 180
Marks:
+1
,
-0
7
9
+
9
7
is divisible by
128
24
64
72
Validate
Solution:
Now,
7
9
=
(
8
−
1
)
9
=
−
1
(
1
−
8
)
9
=
−
1
+
9
C
1
8
−
9
C
2
8
2
+
.
.
.
.
.
.
.
.
+
9
C
9
8
9
and
9
7
=
(
1
+
8
)
7
=
1
+
7
C
1
8
+
7
C
7
8
7
∴
7
9
+
9
7
=
(
9
C
1
+
7
C
1
)
+
8
2
(
7
C
2
−
9
C
2
)
+
.
.
.
.
.
=
8
(
9
+
7
)
+
8
2
(
21
−
36
)
+
.
.
.
.
=
64
×
2
+
64
(
−
15
)
+
.
.
.
Hence, it is divisble by
64
.
© examsiri.com
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