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Amitesh Kumar
Subject: Maths
, asked on 27/12/17
Q.1. The value of
∑
r
=
0
10
·
C
r
10
·
3
r
·
-
2
10
-
r
is
Answer
1
Yayati
Subject: Maths
, asked on 20/12/17
I
f
(
x
2
+
x
-
3
)
279
=
a
0
+
a
1
x
+
a
2
x
2
+
a
558
x
558
f
i
n
d
a
0
+
a
1
+
a
2
+
a
3
+
.
.
.
.
.
.
+
a
558
Answer
1
Aishwarya
Subject: Maths
, asked on 19/12/17
Solve this:
Answer
1
Aishwarya
Subject: Maths
, asked on 19/12/17
Find the term independent of x
4
+
x
+
7
x
2
x
-
3
x
11
Answer
1
Tarunvir Singh
Subject: Maths
, asked on 16/12/17
Please do 13th question
Q13. The -coefficient of x
70
in the product (x – 1) (x
2
– 2) (x
3
–3) (x
4
– 4) ......(x
12
–12) is
(a) 4 (b) 6 (c) 8 (d) 12
Answer
1
Tarunvir Singh
Subject: Maths
, asked on 16/12/17
Please do 9th question:
9. The term independent of 'x' in the expansion of
9
x
-
1
3
x
18
,
x
>
0
,
i
s
α
t
i
m
e
s
t
h
e
c
o
r
r
e
s
p
o
n
d
i
n
g
b
i
n
o
m
i
a
l
c
o
e
f
f
i
c
i
e
n
t
.
T
h
e
n
'
α
'
i
s
a
3
b
1
3
c
-
1
3
d
1
Answer
1
Tarunvir Singh
Subject: Maths
, asked on 16/12/17
Find the coefficientof x^70 in series (x-1)(x^2-2)and ao on till (x^12-1)
Answer
1
Tarunvir Singh
Subject: Maths
, asked on 11/12/17
Do question 1
Answer
1
Pavithra Saravanan
Subject: Maths
, asked on 28/11/17
If the fourth term in the expansion of (ax+1/x)n is 20/27 then find the value of n and a . Also find its 4th term from the end
Answer
1
Shivam Desale
Subject: Maths
, asked on 14/11/17
Qn no. 5
Answer
2
Soumyadeep Kar
Subject: Maths
, asked on 12/11/17
Q. Prove that
∑
r
=
1
k
-
3
r
-
1
3
n
C
2
r
-
1
=
0
,
w
h
e
r
e
K
=
3
n
2
and n is an even positive integer.
Answer
1
Soumyadeep Kar
Subject: Maths
, asked on 12/11/17
Find the sum of the infinite series
a
1
+
a
2
+
a
3
+
.
.
.
.
.
.
.
.
.
.
.
.
.
,
w
h
e
r
e
a
n
=
log
e
3
n
∑
k
=
1
n
2
k
+
1
k
!
n
-
k
!
for each positive integer n.
Answer
0
Soumyadeep Kar
Subject: Maths
, asked on 12/11/17
Q. Find the sum of series
3
1
!
+
5
2
!
+
9
3
!
+
15
4
!
+
23
5
!
+
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
∞
.
Answer
3
Shivam Desale
Subject: Maths
, asked on 10/11/17
Qn no. 1
Answer
1
Nura Mohammad
Subject: Maths
, asked on 9/11/17
Which of the following is larger
99^50+100^50 or 101^50
The part of the answer that is given in the photo please explain. How can we take 100^50 common?
=
2
[
C
1
50
(
100
)
49
+
C
3
50
(
100
)
47
+
.
.
.
.
.
]
=
2
[
50
(
100
)
49
+
C
3
50
(
100
)
47
+
.
.
.
.
]
=
100
50
+
o
t
h
e
r
p
o
s
i
t
i
v
e
t
e
r
m
s
>
100
50
S
o
,
101
50
-
99
50
>
100
50
,
i
.
e
.
,
101
50
>
99
50
+
100
50
H
e
n
c
e
,
101
50
i
s
l
a
r
g
e
r
t
h
a
n
99
50
+
100
50
Answer
1
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What are you looking for?
Q13. The -coefficient of x70 in the product (x – 1) (x2 – 2) (x3 –3) (x4 – 4) ......(x12 –12) is
(a) 4 (b) 6 (c) 8 (d) 12
9. The term independent of 'x' in the expansion of
99^50+100^50 or 101^50
The part of the answer that is given in the photo please explain. How can we take 100^50 common?