Answer:
137,257 people have received the video.
Step-by-step explanation:
Since, the number of videos receive on saturday = 1,
On Saturday, the video are mailed to 7 persons,
So, the number of videos receive on saturday = 7,
On Sunday, each person mail the video to further 7 persons,
So, the number of videos receive on saturday = 49,
Now, on monday each person mail the video to further 7 persons,
So, the number of videos receive on monday = 49 × 7 = 343,
Thus, there is a series that represents the given scenario,
1, 7, 49, 343,....
Which is a GP, having first term, a = 1,
Common ratio, r = 7,
For finding the total number of received videos after 7 days,
Number of terms, n = 7,
Hence, the number of received videos after 7 days,
[tex]S_{7}=\frac{a(r^n-1)}{r-1}[/tex]
[tex]=\frac{1(7^7-1)}{7-1}[/tex]
[tex]=137257[/tex]
Therefore, 137257 people have received the video.
Answer: First one is A and then the second one is 137,257
I got it right for both.
