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Quantitative Aptitude
Highest Power of a Number
4. nbsp; If...
Question
4. If a, b, c are in GP and 4a, 5b, 4c are in AP such that a + b + c = 70, then value of
a
3
+
b
3
+
c
3
i
s
1. 8000 2. 73000 3. 56000 4. 133000
Open in App
Solution
Dear student
Given
:
1
)
a
,
b
,
c
are
in
G
.
P
i
.
e
b
2
=
ac
.
.
.
(
1
)
2
)
4
a
,
5
b
,
4
c
are
in
A
.
P
i
.
e
10
b
=
4
a
+
4
c
5
b
=
2
(
a
+
c
)
.
.
.
.
.
(
2
)
3
)
a
+
b
+
c
=
70
⇒
5
b
2
+
b
=
70
⇒
5
b
+
2
b
2
=
70
⇒
7
b
=
140
⇒
b
=
20
.
.
.
.
(
3
)
Put
the
value
of
b
=
20
in
(
2
)
,
we
get
5
(
20
)
=
2
(
a
+
c
)
⇒
a
+
c
=
50
⇒
a
=
50
-
c
Put
the
value
of
a
and
b
in
(
1
)
,
we
get
20
2
=
(
50
-
c
)
c
⇒
400
=
50
c
-
c
2
⇒
c
2
-
50
c
+
400
=
0
⇒
(
c
-
10
)
(
c
-
40
)
=
0
⇒
c
=
10
and
c
=
40
When
c
=
10
,
then
a
=
40
When
c
=
40
,
then
a
=
10
Case
1
)
When
a
=
10
,
b
=
20
and
c
=
40
a
3
+
b
3
+
c
3
=
10
3
+
20
3
+
40
3
=
1000
+
8000
+
64000
=
73000
Case
2
)
When
a
=
40
,
b
=
20
and
c
=
10
a
3
+
b
3
+
c
3
=
40
3
+
20
3
+
10
3
=
64000
+
8000
+
1000
=
73000
Suggest Corrections
0
Similar questions
Q.
Let
a
,
b
,
c
are in
G
.
P
.
and
4
a
,
5
b
,
4
c
are in A.p. such that
a
+
b
+
c
=
70
, then value of
b
is
Q.
If a,b,c , all distinct are such that a,b, and c are in AP and b-a , c-b and a are in GP then a:b:c =?
Q.
If
a
,
b
,
c
are unequal and different from one such that the points
(
a
3
a
−
1
,
a
2
−
3
a
−
1
)
,
(
b
3
b
−
1
,
b
2
−
3
b
−
1
)
and
(
c
3
c
−
1
,
c
3
−
3
c
−
1
)
are collinear, then
Q.
Three numbers
a
,
b
,
c
are in G.P. If
4
a
,
5
b
and
4
c
are in A.P. and
a
+
b
+
c
=
70
,
then
|
c
−
a
|
equals
Q.
If a, b, c
>
0
, then prove that
a
3
b
3
+
b
3
c
3
+
c
3
a
3
≥
3
.
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