Question

10th term of the harmonic progression is 2/1+5/2+10/3+....is​

Answer 1

Answer:

Power of a lens is -2D, negative sign indicates it is a Concave lens. Focal length (in meters)=1/power of the lens, thus focal length=1/2=0.5m=50cm.In square roots 1 to 100, the numbers 1, 4, 9, 16, 25, 36, 49, 64, 81, and 100 are perfect squares and the remaining numbers are non-perfect squares i.e. their square root will be irrational.

Answer 2

Step-by-step explanation:

Given, HP is

5

1

,

19

4

,

9

2

,

17

4

⋯⋯

⟹5,

4

19

,

2

9

, ⋯⋯ are in AP

⟹d=t

2

−t

1

=

4

19

−5=−

4

1

a=5, d=−

4

1

and t

n

=a+(n−1)d⟹t

10

=a+9d

=5+9×−

4

1

=

4

11

.