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Byju's Answer
Standard VI
Mathematics
Adding Odd Numbers
i The sum of ...
Question
(i) The sum of the first 16 odd numbers is ___
(ii) The sum of the first 25 odd numbers is ___.
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Solution
(i) The sum of first n odd numbers =
n
2
Ex:
1
+
3
+
5
=
3
2
=
9
1
+
3
+
5
+
7
=
4
2
=
16
Similarly,
1
+
3
+
5
+
7
+
.
.
.
.
.
.
.
.
.
+
(
16
t
h
odd no
.
)
=
16
2
=
256
(ii) The sum of first n odd numbers =
n
2
Ex:
1
+
3
+
5
=
3
2
=
9
1
+
3
+
5
+
7
=
4
2
=
16
Similarly,
1
+
3
+
5
+
7
+
.
.
.
.
.
.
.
.
.
+
(
25
t
h
odd no
.
)
=
25
2
=
625
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