If x, y, z are in A.P, then 2y = ?
x + z
x - z
x / z
xz
The 7th term of the series 1, -1/2, 1/4, ........ is ______.
-1/8
1/16
-1/32
1/64
Sum of cubes of first n natural numbers is _______.
None of these
If a, b, c are in G. P, then which of the following is true?
a = bc
b2 = ac
c = ab
a2 = bc
If nth term of the series 1.3 + 3.5 + 5.7 + ...... is _________.
n ( n + 2 )
n ( n + 5 )
( 2n - 1 ) ( 2n + 1 )
2n ( 2n - 1 )
The common ratio of the series 3, -6, 12, -24, ......... is _________.
2
-3
-1/2
-2
There are n arithmetic means between a and b. Then the common difference d is _________.
( b + a ) / ( n + 1 )
( n + 1 ) / ( b + a )
( b - a ) / ( n + 1 )
ab / ( n + 1)
The harmonic mean between a and b is _________.
2ac / ( a + c )
( a + b ) / 2ab
√ab
( a + b ) / ab
The relation between A.M, G.M and H.M is _________.
A2 = GH
G2 = AH
H2 = AG
AG = H
The 7th term of 1/3, 1/7, 1/11, ........... is ____________.
27
0
7/3
1/27
