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Byju's Answer
Standard X
Mathematics
General Form of an AP
S =n/2 [ 2a+ ...
Question
S
=
n
2
[
2
a
+
(
n
−
1
)
d
]
; make
d
the subject of formula.
A
d
=
(
2
S
−
a
)
n
(
n
−
1
)
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B
d
=
(
2
S
−
n
a
)
n
(
n
+
1
)
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C
d
=
2
(
S
−
n
a
)
n
(
n
−
1
)
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D
d
=
2
(
S
−
a
)
n
(
n
+
1
)
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Solution
The correct option is
C
d
=
2
(
S
−
n
a
)
n
(
n
−
1
)
Given,
S
=
n
2
[
2
a
+
(
n
−
1
)
d
]
=
>
2
S
n
=
2
a
+
(
n
−
1
)
d
=
>
2
S
n
−
2
a
=
(
n
−
1
)
d
=
>
2
(
S
−
n
a
)
n
=
(
n
−
1
)
d
=
>
d
=
2
(
S
−
n
a
)
n
(
n
−
1
)
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