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NDA · Maths · Sequence & Series
NDA Sequence & Series — Formulas 3
Question
1
of 12
1.
If the ratio of sums of two APs is f(n):g(n), what is the ratio of their nth terms?
A
a
n
a
n
′
=
f
(
2
n
+
1
)
g
(
2
n
+
1
)
\frac{a_n}{a_n'} = \frac{f(2n+1)}{g(2n+1)}
a
n
′
a
n
=
g
(
2
n
+
1
)
f
(
2
n
+
1
)
B
a
n
a
n
′
=
f
(
2
n
−
1
)
g
(
2
n
−
1
)
\frac{a_n}{a_n'} = \frac{f(2n-1)}{g(2n-1)}
a
n
′
a
n
=
g
(
2
n
−
1
)
f
(
2
n
−
1
)
C
a
n
a
n
′
=
f
(
2
n
)
g
(
2
n
)
\frac{a_n}{a_n'} = \frac{f(2n)}{g(2n)}
a
n
′
a
n
=
g
(
2
n
)
f
(
2
n
)
D
a
n
a
n
′
=
f
(
n
−
1
)
g
(
n
−
1
)
\frac{a_n}{a_n'} = \frac{f(n-1)}{g(n-1)}
a
n
′
a
n
=
g
(
n
−
1
)
f
(
n
−
1
)
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