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Byju's Answer
Standard XII
Mathematics
nth Term of A.P
If 7 times th...
Question
If 7 times the 7
th
term of an A.P. is equal to 11 times its 11
th
term,then find its 18
th
term.
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Solution
Let
a
be
the
first
term
and
d
be
the
common
difference
.
Now
,
a
7
=
a
+
6
d
and
a
11
=
a
+
10
d
Now
,
according
to
question
7
a
7
=
11
a
11
⇒
7
a
+
6
d
=
11
a
+
10
d
⇒
7
a
+
42
d
=
11
a
+
110
d
⇒
7
a
-
11
a
=
110
d
-
42
d
⇒
-
4
a
=
68
d
⇒
a
=
-
17
d
.
.
.
.
.
1
Now
,
a
18
=
a
+
17
d
=
-
17
d
+
17
d
=
0
Hence
,
18
th
term
of
AP
is
0
.
Suggest Corrections
1
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Question 12
If 7 times the
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