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Byju's Answer
Standard X
Mathematics
General Form of an AP
Find the sum ...
Question
Find the sum of even numbers between 200 to 300
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Solution
The
list
of
even
numbers
between
200
and
300
is
,
202
,
204
,
206
,
.
.
.
.
.
.
.
.
,
298
.
Now
,
the
above
list
is
in
AP
,
with
first
term
,
a
=
202
and
common
difference
,
d
=
2
Let
a
n
=
298
⇒
a
+
n
-
1
d
=
298
⇒
202
+
n
-
1
×
2
=
298
⇒
2
n
-
1
=
96
⇒
n
-
1
=
48
⇒
n
=
49
Now
,
sum
of
first
n
terms
of
AP
is
given
by
S
n
=
n
2
2
a
+
n
-
1
d
Now
,
S
49
=
49
2
2
×
202
+
49
-
1
×
2
=
49
202
+
48
=
49
×
250
=
12250
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