Question

find the sum of 0.9+0.81+.729+.......​

Answer 1

Answer:

The difference changes, so it is not an AP. However

81

9

=

9

1

=

9

So it is a GP.

a

=

1

and

r

=

9

Use the formula for the sum of

n

terms:

S

n

=

a

(

r

n

−

1

)

r

−

1

For n = 10.

S

n

=

1

(

9

10

−

1

)

9

−

1

This is the huge answer of

435

,

848

,

050

Answer 2

Answer:

hiiiiiiiiiiiiiiiiiiiiiiiiii

good morning