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Soumyadeep Kar
Subject: Maths
, asked on 26/10/17
Solve this:
Q28. The number of values in set of values of
r
for which
23
C
r
+
3
.
23
C
r
+
1
+
23
C
r
+
2
≥
25
C
15
is
Answer
2
Soumyadeep Kar
Subject: Maths
, asked on 26/10/17
I
f
a
0
2
-
a
1
2
+
a
2
2
-
a
3
2
+
.
.
.
+
a
2
n
2
=
k
a
n
,
t
h
e
n
k
=
1
2
1/2
0
Answer
1
Shivam Gupta
Subject: Maths
, asked on 24/10/17
sir
Q.
10
th
term from end in the expansion of (x + 2)
20
a)
20
C
10
2
10
x
10
b)
20
C
9
2
9
x
11
c)
20
C
4
x
11
2
4
d)
20
C
9
2
11
x
11
Answer
4
Shivam Gupta
Subject: Maths
, asked on 24/10/17
sir
Q.7. Middle term of
3
x
2
-
1
2
x
6
is given as
Choose one :
a.
-
135
2
x
3
b.
135
4
x
3
c.
-
135
4
x
3
d.
135
2
x
3
Answer
6
Shivam Gupta
Subject: Maths
, asked on 24/10/17
sir
Q.5. The value of
2
+
1
3
+
2
-
1
3
is equal to
Choose one :
A. 14
B. 5
2
C. 7
D. 10
2
Answer
5
Shivam Gupta
Subject: Maths
, asked on 24/10/17
sir
Q.11. Number of rational terms in the expansion of
2
x
+
3
y
1
3
48
is
Answer
1
Shivam Gupta
Subject: Maths
, asked on 24/10/17
sir
Answer
2
Shivam Gupta
Subject: Maths
, asked on 24/10/17
If coefficient of (3r + 2)th term and 2rth term in (1 + x)25 is equal then r is equal to
Answer
1
Ruba Balu
Subject: Maths
, asked on 21/10/17
Q.22.Find the value of r if the coefficients of
2
r
+
4
t
h
a
n
d
r
-
2
t
h
terms in the expansion of
1
+
x
18
are equal.
Answer
2
Ruba Balu
Subject: Maths
, asked on 21/10/17
Q). Find the coefficient of
x
4
in the expansion of
1
+
x
+
x
2
+
x
3
13
Answer
3
Ruba Balu
Subject: Maths
, asked on 21/10/17
Q.22. Find the value of r if the coefficients of
2
r
+
4
t
h
a
n
d
r
-
2
t
h
terms in the expansion of
1
+
x
18
are equal.
Answer
1
Ruba Balu
Subject: Maths
, asked on 21/10/17
20th
Q.20. If in the expansion of
1
+
x
n
, the coefficient of
p
t
h
a
n
d
q
t
h
terms are equal, prove that p + q = n + 2, where p
≠
q.
Answer
1
Ruba Balu
Subject: Maths
, asked on 21/10/17
14th
Q.14. Find the ratio of the coefficient of
x
5
to the term independent of x in the expansion of
x
2
+
2
x
15
.
Answer
2
Ruba Balu
Subject: Maths
, asked on 21/10/17
Q.19. Find the value of k if the coefficient of x in
x
2
+
k
x
5
is 270?
Answer
3
Ruba Balu
Subject: Maths
, asked on 21/10/17
15
Answer
1
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What are you looking for?
Q28. The number of values in set of values of r for which is
Q. 10th term from end in the expansion of (x + 2)20
a) 20C10210x10
b) 20C929x11
c) 20C4x1124
d) 20C9211x11
Q.7. Middle term of is given as
Choose one :
a.
b.
c.
d.
Q.5. The value of is equal to
Choose one :
A. 14
B. 5
C. 7
D. 10
Q.11. Number of rational terms in the expansion of is
Q.20. If in the expansion of , the coefficient of terms are equal, prove that p + q = n + 2, where pq.
Q.14. Find the ratio of the coefficient of to the term independent of x in the expansion of .