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Math 11 Chapter 6
Sequences and Series
Test - 5
1.
Terms of a sequence are in a definite order.
a) The sum of cube of first n natural numbers is
b) a
n+1
+b
n+1
/a
n
+ b
n
is H.M between a and b for
c) armonic mean between -2 & 8 is
d) Sum of finite Geometric series is
2.
The general term of the sequenced 2, 4, 6, 8, ….. is
a) n
b) 2n
c) 2n – 1
d) n
2
3.
If a =
Ö
2 , b = 3
Ö
2 then, the A.M. between a and b is:
a) 4, -6, -8
b) -2,0,2
c) 4,6,8.
d) 4,8,12
4.
A.M of a
n
and an
-1
is a
n
+ a
n
-1/2
a) a
n
+ a
n
-1/2
b) a
n
+ b
n
-1/2
c) a
m
+ a
n
-1/3
d) a
n
+ a
n
1/2
5.
The G.M b/w a & b is ____
a) 2ab / a + b
b) (a + b) / 2
c) ±
√
ab
d) None
6.
Common ratio of a
1
, a
1
2
, r
1
, a
1
3
r
1
2
------ is:
a) 140
b) None of the above.
c) 1000
d) 35
7.
In an A.P ratio of any two consecutive term is?
a) same
b) not same
c) is alternative
d) is duplicate
8.
The 5
th
term of G.P 3,6,12, is___________.
a) 21
b) 22
c) 23
d) 34
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