Harmonic Progression
Trending Questions
Q.
If a, b, c, are in H.P. then
All are correct
b+ab−a+b+cb−c=2
a−bb−c=ac
1b−a+1b−c=1a+1c
Q. If a1, a2, a3, …… are in a harmonic progression with a1=5 and a20=25. Then, the least positive integer n for which an<0, is
- 22
- 24
- 25
- 23
Q. If x=∑∞n=0an, y=∑∞n=0bn, z=∑∞n=0cn where a, b, c, are in AP
and |a| <1, |b|<1, |c|<1 then x, y, z are in
and |a| <1, |b|<1, |c|<1 then x, y, z are in
- GP
- AP
- Arithmetic- Geometric progression
- H.P
Q. Let a1, a2, a3...... be in harmonic progression with a1=5 and a20=25. The least positive integer n for which an<0 is
- 25
- 22
- 23
- 24
Q. If a, b, c, d are in H.P. , then ab +bc+cd =
- ad
- 2ad
- 3ad
- 4ad
Q.
If ln(a+c) , ln(a-c) , ln(a-2b+c) are in A.P, then
a, b, c are in A.P.
a2, b2, c2 are in A.P.
a, b, c are in H.P.
a, b, c are in G.P.
Q.
If the roots of a(b−c)x2+b(c−a)x+c(a−b) = 0 be equal then a, b, c are in
A.P
G.P
H.P
None of these
Q.
If a, b, c, d are in H.P., then ab + bc + cd is equal to
3ad
3ac
None of these