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Byju's Answer
Standard IX
Mathematics
Properties of Measures of Central Tendency
Let 9x9x + ...
Question
Let
9
x
9
x
+
3
then find the value of the sum
f
(
1
2006
)
+
f
(
2
2006
)
+
f
(
3
2006
)
+
.
.
.
.
.
.
f
(
2005
2006
)
Open in App
Solution
f
(
x
)
=
9
x
9
x
+
3
f
(
1
−
x
)
=
9
1
−
x
9
1
−
x
+
3
=
9
9
x
9
9
x
+
3
=
9
9
+
3.
9
x
And
f
(
x
)
+
f
(
1
−
x
)
=
9
x
9
x
+
3
+
9
1
−
x
9
1
−
x
+
3
=
3
(
3
+
9
x
)
3
(
3
+
9
x
)
=
1
⇒
f
(
x
)
+
f
(
1
−
x
)
=
1
Now,
f
(
1
2
)
=
9
1
2
9
1
2
+
3
=
3
3
+
3
=
1
2
f
(
1
2006
)
+
f
(
2
2006
)
+
f
(
3
2006
)
+
f
(
4
2006
)
+
.
.
.
+
f
(
2005
2006
)
=
f
(
1
2006
)
+
f
(
2005
2006
)
+
f
(
2
2006
)
+
f
(
2004
2006
)
+
.
.
.
+
f
(
1002
2006
)
+
f
(
1004
2006
)
+
f
(
1003
2006
)
=
f
(
1
2006
)
+
f
(
1
−
1
2006
)
+
f
(
2
2006
)
+
f
(
1
−
2
2006
)
+
.
.
.
+
f
(
1
−
1002
2006
)
+
f
(
1
2
)
Since
f
(
x
)
+
f
(
1
−
x
)
=
1
=
(
1
+
1
+
1
+
1
+
.
.
.
)
(
1002
)
times
+
1
2
=
1002
+
1
2
=
2004
+
1
2
=
2005
2
=
1002.5
Suggest Corrections
0
Similar questions
Q.
Let
f
(
x
)
=
9
x
9
x
+
3
then find the value of the sum
f
(
1
2008
)
+
f
(
2
2008
)
+
f
(
3
2008
)
+
.
.
.
.
.
+
f
(
2007
2008
)
Q.
A page from the Saving Bank Account of Mr. Prateek is given below:
Date
Particulars
Withdrawal
(In Rs.)
Deposit
(In Rs.)
Balances
(In Rs.)
Jan
1
s
t
2006
B/F
-
-
1
,
270
Jan.
7
t
h
2006
By Cheque
-
2
,
310
3
,
580
March
9
t
h
2006
To Self
2
,
000
-
1
,
580
March
26
t
h
2006
By Cash
-
6
,
200
7
,
780
June
10
t
h
2006
To Cheque
4
,
500
-
3
,
280
July
15
t
h
2006
By Clearing
-
2
,
630
5
,
910
October
18
t
h
2006
To Cheque
530
-
5
,
380
October
27
t
h
2006
To Self
2
,
690
-
2
,
690
November
3
r
d
2006
By cash
-
1
,
500
4
,
190
December
6
t
h
2006
To Cheque
950
-
3
,
240
December
23
r
d
2006
By Transfer
-
2
,
920
6
,
160
If he receives Rs.
198
as interest on
1
s
t
January,
2007
, find the rate of interest paid by the bank.
Q.
How many ordered pairs of positive integers
(
x
,
y
)
satisfy the equation
x
√
y
+
y
√
x
+
√
2006
x
y
−
√
2006
x
−
√
2006
y
−
2006
=
0
?
(correct answer + 3, wrong answer 0)
Q.
A page from the saving bank account of Priyanka is given below:
Date
Particulars
Amount withdrawn (Rs)
Amount deposited (Rs)
Balance (Rs)
03
/
04
/
2006
B/F
-
-
4
,
000.00
05
/
04
/
2006
By cash
-
2
,
000.00
6
,
000.00
18
/
04
/
2006
By cheque
-
6
,
000.00
12
,
000.00
25
/
05
/
2006
To cheque
5
,
000.00
-
7
,
000.00
30
/
05
/
2006
By cash
-
3
,
000.00
10
,
000.00
20
/
07
/
2006
By self
4
,
000.00
-
6
,
000.00
10
/
09
/
2006
By cash
-
2
,
000.00
8
,
000.00
19
/
09
/
2006
To cheque
1
,
000.00
-
7
,
000.00
If the interest earned by Priyanka for the period of ending September,
2006
is Rs.
175
, find the rate of interest (in
%
).
Q.
Let
f
(
x
)
=
9
x
9
x
+
3
. Show
f
(
x
)
+
f
(
1
−
x
)
=
1
, and hence evaluate
f
(
1
1996
)
+
f
(
2
1996
)
+
f
(
3
1996
)
+
.
.
.
+
f
(
1995
1996
)
.
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