Harmonic sequence

Which of the terms below may form a harmonic sequence?

• 3, 5, 7, 9, ....

• 1/2. 1/4, 1/8, 1/16, ...

• 1/3, 1/6, 1/9, 1/12, ....

• 2,4,8,16,.....

Find the 10th term in the harmonic sequence that starts with

4, 2, 4/3,1

• 1/2

• 2/3

• 2/5

• 1/5

Find the 13th term of the harmonic sequence that starts with 1, 3/5, 3/7, 1/3.

• 1/3

• 2/9

• 1/9

• 2/3

Find the harmonic mean between 5 and 10.

• 3/20

• 20/3

• 1/20

• 1/3

Find the harmonic mean of -4 and 2.

• 4

• -2

• 8

• 0

If a1, a2……… are in AP then a1-1, a2-1……… are in __________

• A.P

• G.P

• H.P

• None of the above

The ninth term of 1⁄3, 1⁄7, 1⁄11, 1⁄15, 1⁄19,……… is given by?

• 1/35

• 1/36

• 1/39

• 1/37

For number A, C if H is harmonic mean, G is geometric mean then H>=G.

• True

• False

Which of the following gives the right inequality for AM, GM, HM?

• AM>=HM>=GM

• GM>=AM>=HM

• AM>=GM>=HM

• GM>=HM>=AM

For two number a,b HM between them is given by?

a)

b)

c)

d)

• (2b+2a )/3b

• 2ab/(a+b)

• (a+b)/2ab

• 2b/(a+b)