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Byju's Answer
Standard X
Mathematics
General Form of an AP
If in an A.P....
Question
If in an A.P.,
T
7
=
18
,
T
18
=
7
,then find
T
101
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Solution
T
7
=
18
=
a
+
(
7
−
1
)
d
a
+
6
d
=
18
_______
(
1
)
T
18
=
7
=
a
+
(
18
−
1
)
d
a
+
17
d
=
7
_______
(
2
)
(
1
)
−
(
2
)
a
+
6
d
−
a
−
17
d
=
18
−
7
−
11
d
=
11
d
=
−
1
a
−
6
=
18
⇒
a
=
24
T
101
=
a
+
100
d
=
24
−
100
=
−
76
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