If a and b are two dfferent positive real numbers, then which of the following relations is true ?
2 √ab > ( a + b )
2 √ab < ( a + b )
2 √ab = ( a + b )
None of these
If log 2, log (2n -1 ) and log (2n + 3 ) are in AP, then n is equal to
5/2
log 25
log 35
3/2
If a, b, c, d, e, f are in AP, then e - c is equal to _____.
2 ( c - a )
2 ( f - d )
2 (d - c )
d - c
0
1
-1
10
The number of terms of the AP 3, 7, 11, 15, 15, - - - - - - to be taken so that the sum is 406 is
5
12
14
The A.M between pth and qth terms of an A.P is equal to the A.M between rth and sth terms of the A.P. Then p + q =
r + s
r - s/ r + s
r + s/ r - s
r + s = 1
Let a, b, c be A.P then 1/c, b/ac, 1/a are in ________.
G.P
A . P
H. P
If progressions 3, 10, 17, .. . . . . and 63,65, 67, . . . . . . are such that their nth terms are equal, then n is equal to :
13
15
9
8
If a, b, c are in A.P, then 3a, 3b, 3c are in.
A.P
H.P
