Given:
The sequence is
436, 218, 109, 54.5, 27.25,...
To find:
The explicit formula for the given sequence.
Solution:
We have,
436, 218, 109, 54.5, 27.25,...
It is a GP because the two consecutive terms have common ratio.
Here,
First term : a=436
Common ratio : d = 
= 
= 
Now, the explicit formula for a GP is

Where, a is the first term and r is the common ratio.
Putting a=436 and r=0.5, we get

Therefore, the correct option is c.
Step-by-step explanation:
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Answer:
4 and -5 for the first one
-5 and -5 for the second
5 and -4 for the third
-4 and 5 for the fourth
Answer:
0.32
Step-by-step explanation:
P(B|A) = P(A∩B) / P(A)
0.25 = 0.08 / P(A)
P(A) = 0.32