Answer:
D) 15
Step-by-step explanation:
This is an arithmatic progression.
The formula for the sum of arithmatic progression is

where d is the common difference between successive terms and a is the first term. By applying this formula,

A=8. B=4 C=4 D=5. That’s the answer
Answer:
15
Step-by-step explanation:
Answer:
There are always four sides and four corners
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