Sum of Arithmetic Progression

Problem
There are 7 arithmetic means between 3 and 35. What is the sum of all the terms?

A.   133 C.   665
B.   608 D.   171

 

Problem
How many terms from the progression 3, 5, 7, 9, ... must be taken in order that their sum will be 2600?

A.   80 C.   50
B.   60 D.   70

 

 
 
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