Question

the first four terms of geometric progression are 0.5,1,2,and 4. Find the smallest number of terms that will give a sum greater than 1000000

Answer 1

Answer:

not able to understand sorry

Answer 2

Hlo bro here is your solution

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Let the sum of the four terms of the geometric series be a+ar+ar

2

+ar

3

and r>0

Given that a+ar=8 and ar

2

+ar

3

=72

Now, ar

2

+ar

3

=r

2

(a+ar)=72

⇒r

2

(8)=72∴r=±3

Since r>0, we have r=3.

Now, a+ar=8⇒a=2

Thus, the geometric series is 2+6+18+54.