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Standard V
Mathematics
Language Patterns
Solve :First ...
Question
Solve :First term of AP is 7 ,if the sum of first 4 terms is half of the sum next four terms .find the common difference
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Solution
Let
a
be
the
first
term
and
d
be
the
common
difference
.
Now
,
a
=
7
Now
,
sum
of
first
n
terms
of
AP
is
given
by
S
n
=
n
2
2
a
+
n
-
1
d
Now
,
sum
of
first
8
terms
is
S
8
=
8
2
2
×
7
+
7
d
=
4
14
+
7
d
=
56
+
28
d
Now
,
S
4
=
4
2
2
×
7
+
3
d
=
2
14
+
3
d
=
28
+
6
d
Now
,
sum
of
next
4
terms
=
S
8
-
S
4
=
56
+
28
d
-
28
+
6
d
=
28
+
22
d
Now
,
according
to
question
:
S
4
=
1
2
S
8
-
S
4
⇒
28
+
6
d
=
1
2
28
+
22
d
⇒
56
+
12
d
=
28
+
22
d
⇒
22
d
-
12
d
=
56
-
28
⇒
10
d
=
28
⇒
d
=
28
10
=
14
5
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