If x, y, z are in A.P, then 2y = ?
x + z
x - z
x / z
xz
12 + 22 + 32 + ............ + 1002 = ?
5050
( 5050 )2
42925
None of these
The harmonic mean between a and b is _________.
2ac / ( a + c )
( a + b ) / 2ab
√ab
( a + b ) / ab
Sum of cubes of first n natural numbers is _______.
The sum of the series 1 + 1/2 + 1/22 + .......... is __________.
1
1/2
2
The 10th term of the A.P 13, 8, 3, -2, ......... is _____________.
-32
32
-57
-52
The sum of the squares of first n natural numbers is _______.
The relation between A.M, G.M and H.M is _________.
A2 = GH
G2 = AH
H2 = AG
AG = H
The 7th term of the series 1, -1/2, 1/4, ........ is ______.
-1/8
1/16
-1/32
1/64
The sum to n terms of 1, 8, 27, 64, ........ is ______.
