Question

find the sum of the series 1+2+4+ .... upto 10 terms​

Answer 1

Sn = ar^(n-1)

$= 1 \times {2}^{9} = 512$

Answer 2

Step-by-step explanation:

Here a=1,r=

1

2

=

2

4

=2

and n=9

We know, S

n

=a[

r−1

r

n

−1

],r>1

=1[

2−1

2

9

−1

]

=

1

256−1

=255

Therefore, the sum of the series is 255.

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