The series will be:

Hence, Option A is the right answer
Step-by-step explanation:
The series can be fount out by putting the values of i in the expression written with the summation
The expression is:

while i = 1 to 25
Putting i = 1

Putting i = 2

Putting i = 3

....
Putting i = 25

The series will be:

Hence, Option A is the right answer
Keywords: Summation, Series
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Answer:
It looks like (-1, ∞)
Step-by-step explanation:
Answer:
Step-by-step explanation:

We are given the following:
AB = 4800 miles
AO = 4000 miles
There is also a rule that states that a line tangent to a circle, will be perpendicular to the radius of the circle at the point of tangency. Therefore, triangle BAO is a right triangle.
We use Pythagorean theorem to solve for the hypotenuse BO.
BO = √(AO²+AB²) = √(4000²+4800²) = 6248 miles
But the problem asks for the length of BC. Since we know that OC is a radius of the circle, then:
BC = 6248 - 4000 = 2,248 miles.
The answer is C.