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Ruba Balu
Subject: Maths
, asked on 21/10/17
Q.13. Find the coefficient of
x
7
i
n
a
x
+
1
b
x
11
a
n
d
x
-
7
i
n
a
x
-
1
b
x
2
11
and find the relation between a and b so that these coefficients are equal.
Answer
2
Aman Dagar
Subject: Maths
, asked on 20/10/17
Solve this :
21
.
Using
binomial
theorem
,
show
that
3
2
n
+
2
-
8
n
-
9
is
divisible
by
8
.
Hint
:
3
2
n
+
2
=
9
3
2
n
=
9
1
+
8
n
,
Now
use
binomial
theorem
.
22
.
Prove
that
,
∑
r
=
o
20
C
20
-
r
20
(
2
-
t
)
20
-
r
(
t
-
1
)
r
=
1
23
.
Find
the
middle
term
(
s
)
in
x
-
1
x
8
Answer
4
Aman Dagar
Subject: Maths
, asked on 20/10/17
Q.7. In the expansion,
1
+
x
14
, write the coefficient of
x
12
.
Answer
2
Aman Dagar
Subject: Maths
, asked on 20/10/17
Q 3 and 4
Q.3. Write number of terms in the expansion of
1
+
2
x
+
x
2
10
.
Q.4. Write number of terms in
2
a
-
b
15
Answer
1
Ruba Balu
Subject: Maths
, asked on 17/10/17
6th
Q.6. If the fourth term in the expansion of
x
+
1
x
n
i
s
5
2
, then find the values of k and n.
Answer
1
Ruba Balu
Subject: Maths
, asked on 17/10/17
5th
Q.5) If P is the sum of odd terms and Q the sum of even terms in the expansion of
(
x
+
y
)
n
, then prove that:
x
2
-
y
2
n
=
P
2
-
Q
2
Answer
2
Pawan Meena
Subject: Maths
, asked on 7/10/17
Q. If C
0
, C
1
, C
2
, .........C
n denote the binomial coefficients n the expansion of (1+x)
n
, then
∑
0
≤
r
<
s
≤
n
∑
C
r
Cs =
Answer
2
Shubhrajyoti Ghosh
Subject: Maths
, asked on 20/9/17
No links please
2
.
G
i
v
e
n
f
(
x
)
=
x
3
-
6
x
2
+
9
x
-
8
.
F
i
n
d
t
h
e
v
a
l
u
e
s
o
f
x
f
o
r
w
h
i
c
h
f
'
(
x
)
=
0
.
H
e
n
c
e
d
e
t
e
r
m
i
n
e
t
h
e
m
a
x
i
m
u
m
a
n
d
m
i
n
i
m
u
m
v
a
l
u
e
s
o
f
f
(
x
)
b
y
t
h
e
c
r
i
t
e
r
i
o
n
i
n
v
o
l
v
i
n
g
s
i
g
n
s
o
f
f
'
(
x
)
2
.
x
=
1
a
n
d
x
=
3
,
m
a
x
v
a
l
u
e
=
-
4
(
a
t
x
=
1
)
,
m
i
n
v
a
l
u
e
=
-
8
(
a
t
x
=
3
)
Answer
1
Dharunika Vijayakumar
Subject: Maths
, asked on 17/9/17
prove that 1/1.2.3 + 1/2.3.4+ ...... 1/n(n+1) (n+2) by using P. M .I
Answer
1
Sai Vignesh Follow Me @sigvins...
Subject: Maths
, asked on 21/8/17
the first ring of a carbon resistor is green in colour the second ring is violent and the 3rd ring is black and the 4th ring is gold find the total tolerance?
Answer
1
Lioncub
Subject: Maths
, asked on 30/7/17
Find n, if 2n c1, 2n c2, 2n c3 are three consecutive terms of a.p.
Answer
1
Lioncub
Subject: Maths
, asked on 30/7/17
If x = 1+i, then find the value of x^3 + 7x^2 - x+16
Answer
1
Varun Gupta
Subject: Maths
, asked on 7/7/17
Solve this:
Answer
2
Varun Gupta
Subject: Maths
, asked on 7/7/17
Solve this:
Answer
1
Arshia Sharma
Subject: Maths
, asked on 7/7/17
If x^r occurs in the expansion of (x+1/x)^n ,find its coefficient.
Answer
1
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What are you looking for?
Q.3. Write number of terms in the expansion of .
Q.4. Write number of terms in
Q.6. If the fourth term in the expansion of , then find the values of k and n.
Q.5) If P is the sum of odd terms and Q the sum of even terms in the expansion of , then prove that:
If x = 1+i, then find the value of x^3 + 7x^2 - x+16