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Sequences and Series
- Online Test
Sequences and Series
TEST : 5
# Sequences and Series
# CBSE 11th Mathematics
Prepare / Learn
Q1.
If the numbers a,b,c,d,e are in A.P then find the value of a-4b+6c-4d+e
A.
0
B.
1
C.
-1
D.
2
View Solution
Add Work Space
Answer :
Option A
Explaination / Solution:
# Sequences and Series
# CBSE 11th Mathematics
Prepare / Learn
Q2.
If a, b, c, d , e are in G. P., then
e
c
equals
A.
c
b
B.
d
c
C.
b
a
D.
d
b
View Solution
Add Work Space
Answer :
Option D
Explaination / Solution:
# Sequences and Series
# CBSE 11th Mathematics
Prepare / Learn
Q3.
The product of first n odd terms of a G.P. whose middle term is m is
A.
n
m
B.
none of these
C.
m
n
D.
mn
View Solution
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Answer :
Option C
Explaination / Solution:
# Sequences and Series
# CBSE 11th Mathematics
Prepare / Learn
Q4.
The fourth term of a G. P. is 2, then product of first 7 terms is
A.
32
B.
128
C.
30
D.
64
View Solution
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Answer :
Option B
Explaination / Solution:
# Sequences and Series
# CBSE 11th Mathematics
Prepare / Learn
Q5.
If three positive numbers a, b, c are in G. P. then log a, log b, log c are in
A.
A.P.
B.
G.P.
C.
A.G.P.
D.
H.P.
View Solution
Add Work Space
Answer :
Option A
Explaination / Solution:
# Sequences and Series
# CBSE 11th Mathematics
Prepare / Learn
Q6.
The nth term of the sequence 5 + 55 + 555 + …. is
A.
5
×
10
n
−
1
B.
5
9
[
10
n
−
1
]
C.
5
×
11
n
−
1
D.
None of these
View Solution
Add Work Space
Answer :
Option B
Explaination / Solution:
# Sequences and Series
# CBSE 11th Mathematics
Prepare / Learn
Q7.
The sum of first three terms of a G.P. is to the sum of next three terms is 125 : 27. The common ratio of the G.P. is
A.
5
3
B.
1
2
C.
None of these
D.
3
5
View Solution
Add Work Space
Answer :
Option D
Explaination / Solution:
# Sequences and Series
# CBSE 11th Mathematics
Prepare / Learn
Q8.
Sum of an infinitely many terms of a G.P. is 3 times the sum of even terms. The common ratio of the G.P. is
A.
none of these
B.
3
2
C.
2
D.
1/2
View Solution
Add Work Space
Answer :
Option D
Explaination / Solution:
# Sequences and Series
# CBSE 11th Mathematics
Prepare / Learn
Q9.
If
a
n
+
b
n
a
n
−
1
+
b
n
−
1
be the arithmetic mean between two distinct positive reals a and b then the value of n is
A.
1
2
B.
-
1
2
C.
1
D.
0
View Solution
Add Work Space
Answer :
Option C
Explaination / Solution:
# Sequences and Series
# CBSE 11th Mathematics
Prepare / Learn
Q10.
I
f
a
+
b
x
a
−
b
x
=
b
+
c
x
b
−
c
x
=
c
+
d
x
c
−
d
x
,
x
≠
0
,
then a, b, c, d are in
A.
A.P.
B.
H.P.
C.
None of these
D.
G.P.
View Solution
Add Work Space
Answer :
Option D
Explaination / Solution:
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