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Byju's Answer
Standard X
Mathematics
Arithmetic Mean
Q #160;21. ...
Question
Q
21
.
I
f
N
=
15
+
35
+
21
+
5
3
+
2
5
+
7
,
t
h
e
n
2
N
-
3
2
-
7
i
s
e
q
u
a
l
t
o
:
A
2
B
3
C
0
D
1
Open in App
Solution
Dear student
N
=
15
+
35
+
21
+
5
3
+
2
5
+
7
N
=
15
+
21
+
35
+
5
3
+
5
+
5
+
7
N
=
3
5
+
7
+
5
7
+
5
3
+
5
+
5
+
7
N
=
3
+
5
5
+
7
3
+
5
+
5
+
7
1
N
=
3
+
5
+
5
+
7
3
+
5
5
+
7
1
N
=
1
5
+
7
+
1
3
+
5
1
N
=
5
-
7
5
-
7
+
3
-
5
3
-
5
1
N
=
5
-
7
-
2
+
3
-
5
-
2
1
N
=
-
1
2
5
-
7
+
3
-
5
1
N
=
7
-
3
2
N
=
2
7
-
3
Consider
,
2
N
-
3
2
-
7
=
4
7
-
3
-
3
2
-
7
=
4
7
+
3
7
-
3
-
3
2
-
7
=
7
+
3
-
3
2
-
7
=
7
-
7
=
0
Note
:
a
2
-
b
2
=
(
a
-
b
)
(
a
+
b
)
Regards
Suggest Corrections
0
Similar questions
Q.
If the sum of the series
12
C
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7
.
12
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∣ ∣
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∣
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